Yes, they have to look at the evidence such as decay products, particle tracks, as well as interactions/collisions with other particles. As Aristotle views were accepted throughout Europe for almost 2000 years the idea of atoms was shelved for centuries to come. Grades: 5th - 12th. The total number of protons in the nucleus of an atom gives us the atomic number of that atom. Subjects: Chemistry, Physical Science. Atoms are the building blocks of matter. So if someone tells you An ion of platinum has a mass number of 195 and contains 74 electrons. So let's go up to the, our periodic table and we see fluorine right You'll get a detailed solution from a subject matter expert that helps you learn core concepts. So this is actually an In a real research facility, you would provoke a nuclear chain reaction if you changed the number of neutrons in the nucleus of an atom. A Lithium atom with Atomic number = 3 and Mass number = 7 Create an isotope of the atom on the holotable. Direct link to 20lovins.adalynne's post What is the difference be, Posted 6 years ago. well how many neutrons do you have to add to of protons as mentioned in periodic table? Dbxconverter.net Mass Number of 3 and Neutral Charge. Write a symbol for each of the following neutral isotopes. An atom consists of two regions. Isotopes are those atoms having same atomic number (number of protons are same) but different mass number (number of neutrons differ). Oxygen is the most common element by mass (43% of all weight; carbon is 16% and hydrogen is 10%) in the body. electron than we have protons. Think like this Human is the Element and Male and Female are isotopes. If the charge is positive, there are more protons than electrons. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Legal. Write both A/Z and symbol-mass formats for the atoms in Example \(\PageIndex{1}\). There are several forces at work inside the nuclei of atoms. protons, well we can go right over here to the atomic For an example of this notation, await to the chromium atom shown below: Another way to refer to a specific cantlet is to write the mass number of the cantlet afterwards the name, separated by a hyphen. For example, any atom with an atomic number of 8 (its nucleus contains 8 protons) is an oxygen atom, and any atom with a different number of protons would be a different element. Put your understanding of this concept to test by answering a few MCQs. (d) Now test your predictions from (a), (b), and (c). Atoms of the element chromium \(\left( \ce{Cr} \right)\) have an atomic number of 24 and a mass number of 52. Test your knowledge on atomic number mass number! Thus the two nuclei would be Nickel-59 or Ni-59 and Uranium-238 or U-238, where 59 and 238 are the mass numbers of the two atoms, respectively. The composition of any cantlet can be illustrated with a autograph notation chosen A/Z format. The electrons (negative charge) occupy a large, spherical cloud surrounding the nucleus. Exactly! In other words, a piece of lithium always contains both types of naturally occurring lithium (the type with 3 neutrons and the type with 4 neutrons). the number of protons, you should be able to look at Great video! you've had a go at it. These are examples of what is known as an emergent property -- a property possessed by a group that is not present in any individual making up that group. Moreover, it always contains the two in the same relative amounts (or "relative abundance"). Why?how? Isotopes are the atoms with the same number of protons but different in number of neutrons. Does this match your prediction from (b)? Every hydrogen atom has one proton in its nucleus. Nine plus nine is 18. All the atoms of a particular element have the same number of protons, and hence the same atomic number. For example, one gold atom has all of the properties of gold and is still a solid metal at room temperature.". I do have a , Posted 6 years ago. Does this match your prediction from (c)? Thus the atomic number of Na atom = number of electrons = number of protons = 11. Chemistry, 21.06.2019 18:30. Allison Soult, Ph.D. (Department of Chemical science, Academy of Kentucky), Source: https://chem.libretexts.org/Courses/Furman_University/CHM101%3A_Chemistry_and_Global_Awareness_(Gordon)/03%3A_Atoms_and_the_Periodic_Table/3.04%3A_Atomic_Mass_and_Atomic_Number, Which is a Homologous Structure to the Human Forearm, Identify the Features of Stocks and Bonds, Why Might a Hippie Male Have Worn His Hair Long, How to Make Hydroxyquinoline at Home With Grapefruit and Lemon, Establishing a Link Between Malpractice and Harm is, Explain How Wars and Conquests Affect Social Change, Provide the Coefficients Needed to Balance the Redox Reaction Given, Which Best Describes Hemingways Style of Writing in the Excerpt, What Advantage Does Nuclear Power Have Over Fossil Fuels Apex, How Did Abraham Lincoln Become a Lawyer Brainly. Protons, together with electrically neutral particles called neutrons, make up all atomic nuclei except for the hydrogen nucleus (which consists of a single proton). This process is called radioactive decay. None of these. But in this case, we have THEORY MEDIA MISSION Position as many neutrons and protons required in the nucleus and as many electrons on the orbitals to create an atom with mass number of 3 and a neutral charge. To find the number of neutrons, subtract the number of protons from the mass number. When we want to find out the valency, we look at electrons only in the outermost shell of the atom. plus the neutrons are 32, and it has two more electrons To write down the numbers of electrons in each energy level. \[ \begin{align}\text{atomic number} = \left( \text{number of protons} \right) &= 3 \nonumber \\ \left( \text{number of neutrons} \right) &= 3 \nonumber\end{align} \nonumber \], \[ \begin{align} \text{mass number} & = \left( \text{number of protons} \right) + \left( \text{number of neutrons} \right) \nonumber\\ \text{mass number} & = 3 + 3 \nonumber\\ &= 6 \nonumber \end{align}\nonumber \], \[ \begin{align}\text{atomic number} = \left( \text{number of protons} \right) &= 3 \nonumber\\ \left( \text{number of neutrons} \right) & = 4\nonumber\end{align}\nonumber \], \[ \begin{align}\text{mass number} & = \left( \text{number of protons} \right) + \left( \text{number of neutrons} \right)\nonumber \\ \text{mass number} & = 3 + 4\nonumber \\ &= 7 \nonumber \end{align}\nonumber \]. Using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main-group (representative) element, transition metal, or inner transition metal: Predict and test the behaviour of particles fired at a Rutherford atom model. The number of protons present in the platinum ion is 78. Direct link to AmirParsa's post Can an atom have less neu, Posted 3 years ago. b. Well, the protons have a positive charge. Due to the scale of the simulation, it is best to start with a small nucleus, so select 20 for both protons and neutrons, min for energy, show traces, and then start firing particles. Direct link to david.marlyngayle's post What is the specific diff, Posted 8 years ago. mass number (represented by the letter of the alphabet A) 1, point, 67, , 10, start superscript, minus, 24, end superscript, The first sentence of the section "The structure of an atom" reads: "An atom is the smallest unit of matter that retains all of the chemical properties of an element. Every nucleus of a given chemical . To write a nuclear symbol, the mass number is placed at the upper left (superscript) of the chemical symbol and the atomic number is placed at the lower left (subscript) of the symbol. ion, it has a charge. 94% of StudySmarter users get better grades. Carb, Posted 3 years ago. (a) Predict the paths taken by particles that are fired at atoms with a Rutherford atom model structure. Why are the elements made in laboratories unstable? The number of protons and neutrons combines to give us the mass number of an atom. (except hydrogen). \[\text{number of neutrons} = 40 - 19 = 21. So, an element is defined by the number of protons it has. Isotopes of any given element all contain the same number of protons, so they have the same atomic number (for example, the atomic number of helium is always 2). What is the formula for a mass number of an atom? The mass number reports the mass of the atoms nucleus in atomic mass units (amu). The neutral Carbon atom has 6 electrons. So, must because it is Direct link to Navon John Lukose's post Since electrons have like, Posted 8 years ago. Direct link to Nathan Shapiro's post In the fourth paragraph, , Posted 8 years ago. Of proton=6 electron= 6. 7 years ago. However, you are incorrect that their existence is just a guess. Atoms of different elements have different atomic numbers. Helium, with two protons, will have two electrons. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. In this notation, the atomic number is not included. \[\text{number of protons} = 30 \nonumber \], \[\text{number of electrons} = 30 \nonumber \]. It is important to note that the mass number is not given on the periodic table. and I'll give you a hint, you might want to use So what would happen if the gold atom was split? negative charge right here and this is, you can use Luckily, one electron has the same charge (with opposite sign) as a proton. Its nucleus also contains two neutrons. They combine in numerous patterns and form different substances. and so on. Include the atomic number and mass number for each. That's what makes this one fluorine. How did Dalton miss this? a neutral aluminum atom has a mass number of 27, an atomic number of 13, and a charge of 0. how many protons does it have. Create a cation. What's the difference between an Isotope and an Ion? This term was first introduced by Henry Gwyn-Jefferies Moseley. Put the following onto the holotable: - 3 protons - 3 electrons - 5 neutron Students also viewed An ion is an atom with a non neutral electric charge; an atom missing or having too many electrons. It has no charge or neutral charges (0) is neutron 6.An atom becomes neutral when there is equal number of protons and neutron 7. Thanks very much to everyone who noticed this problem and upvoted or commented on it. atomic number (represented by the alphabetic character Z) i know this is a stupid question but i m confuse .. how can we so sure that an element has same no. 3.4: Atomic Mass and Atomic Number Terminal updated Save as PDF Page ID 91936 Learning Outcomes Ascertain diminutive and mass numbers. thanks buyjus for such a good explanation and for extra questions. Every hydrogen atom has 1 proton in its nucleus. Don't the elements immediately break apart or something? Posted 8 years ago. The number of neutrons present in the platinum ion is (195-78)=117. The electromagnetic force of the protons wants to push them away from each other. Most hydrogen atoms have just one proton, one electron, and lack a neutron. Considering atoms are electrically neutral, the number of positively charged protons must exist equal to the number of negatively charged electrons. Answers: 2 Show answers Another question on Chemistry. Knowing the mass number and the atomic number of an atom allows you to determine the number of neutrons present in that atom by subtraction. Sublevels are made up of orbitals with the same energy. But do you know what mass number, or even what atomic number is? An cantlet tin be classified as a particular element based solely on its atomic number. A little more than three-quarters of naturally occurring elements exist as a mixture of isotopes, and the average isotopic mass of an isotopic mixture for an element in a defined environment on Earth determines the elements standard atomic weight. Usually one or two isotopes of an element are the most stable and common. See Answer Conventional representation for a neutral atom is given below: The symbol of the elements consists of one or two letters that always starts with a capital, The symbol Z is the atomic number which is equal to the number of protons and. Am I correct in assuming as such? In this table, an elements atomic number is indicated in a higher place the elemental symbol. For example, carbon atoms with the usual 6 neutrons have a mass number of 12 (6 protons + 6 neutrons = 12), so they are called carbon-12. As atomic number = number of protons, therefore, number of protons = 78, We know that mass number = number of protons + number of neutrons, In a neutral atom, the number of electrons = the number of protons, However, since it is an ion, the charge will be 78-74= +4. more, we're going to have a negative two charge and The mass number, however, is 6 in the isotope with 3 neutrons, and 7 in the isotope with 4 neutrons. Identify the charge and relative mass of subatomic particles. Be clear and specific. (c) the isotope with 33 protons and 40 neutrons in its nucleus. It has a positive electric charge (+1e) and a rest mass equal to 1.67262 10 27 kg . Well, we know we have a So 16 plus 16 is 32. Somebody. \[\text{number of electrons} = 19 \nonumber \]. How many protons, electrons, and neutrons are in an atom of \(^{40}_{19}\ce{K}\)? a surplus of electrons. Add the mass of protons and neutrons to calculate the atomic mass of a single atom of an element. \[\text{Number of neutrons} = \text{ rounded mass number} - \text{atomic number}\]. So, the sulfurs that have Allison Soult, Ph.D. (Department of Chemistry, University of Kentucky). Direct link to Sandaruwan Fonseka's post Hydrogen is the element !, Posted 6 years ago. Mass Number is the sum of the . For example, nitrogen has seven protons in its nucleus and seven neutrons, supplying it with 14 masses. It isn't different. Direct link to Ved Pant's post What's the difference bet, Posted 6 years ago. Hydrogen atoms all have one electron occupying the space outside of the nucleus. The most common way of showing the arrangement of electrons in an atom is to draw diagrams like those shown in the diagram. so does that mean that you can figure out the number of protons by looking at the top of the element? - [Narrator] An isotope Lithium atoms have three protons, beryllium atoms have four, and so on. a periodic table and figure out what element they are talking about. Click the red submit button when you are done. to have nine neutrons. 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Calculate each of the three subatomic particles and give specific group or catamenia names for each atom. The moment an electron absorbs energy, it will not, jump to the next higher energy level. Hydrogen, at the upper left of the table, has an atomic number of 1. The single most important characteristic of an atom is its atomic number (usually denoted by the letter Z), which is defined as the number of units of positive charge (protons) in the nucleus. If you're seeing this message, it means we're having trouble loading external resources on our website. The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom. Direct link to Nathan Shapiro's post Exactly! atomic mass number, and number of electrons. Its diminutive number is two, then it has two protons in its nucleus. One could argue that everything you are, including your consciousness, is the byproduct of chemical and electrical interactions between a very, very large number of nonliving atoms! So as an incredibly complex being made up of roughly 7,000,000,000,000,000,000,000,000,000 atoms, you'll probably want to know some basic chemistry as you begin to explore the world of biology, and the world in general. Best study tips and tricks for your exams. The answer is that the negatively charged electron clouds of the atoms will repel each other if they get too close together, resulting in our perception of solidity. put 2 neutrons (yellow) and 1 proton (red) in nucleus, then put 1 electron (blue) in orbitals. And I encourage you to Atomic number and mass number are always whole numbers because they are obtained by counting whole objects (protons, neutrons, and electrons). So, Carbon-12, which has an atomic mass number of 12, has 6 neutrons (12 nucleons - 6 protons = 6 neutrons). A neutron is made of two down quarks and one up quark. Consider the table beneath, which shows information from the first 6 elements of the periodic table. Direct link to Dhruv Rajput's post i know this is a stupid q, Posted 5 years ago. Orbitals are the name for these sections. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. what is ion? Well, the first thing that Lithium, for example, has three protons and four neutrons, giving information technology a mass number of 7. In the chemical classroom, the proton count will always be equivalent to an atom's atomic number. sulfur atoms are going to have 16 protons, but Direct link to mariam tagourti's post so does that mean that yo, Posted 5 years ago. Include the atomic number and mass number for each. At stp, what is the volume of 1 mole of co2? Direct link to alicksinyangwe's post Hyphen notation can be al, Posted 6 years ago. And that's why also I can't answer your practices correctly. Direct link to jessicalacorte6's post And here is where I got c, Posted 5 years ago. If not, explain the effect of increased energy on the actual path as shown in the simulation. Identify the elements based on the statements below. A neutral atom is an atom where the charges of the electrons and the protons balance. Remember, your atomic number It turns out that elements found in nature exist as constant uniform mixtures of their naturally occurring isotopes. For example, the atomic number of carbon is 6 giving us six electrons as 2,4. Since atoms are neutral, the number of electrons in an atom is equal to the number of protons. The mystery on the line spectra of an H-atom was resolved by, He proposed that an atom has concentric shells or orbit of electrons, surrounding the positively charged nucleus. Determine the number of electrons present. Chemistry questions and answers create an atom with mass number equal to 3 and neutral charge. Atomic number and mass number are always whole numbers because they are obtained by counting whole objects (protons, neutrons, and electrons). The transition from higher to lower, energy level of the electron emits a radiation that has a corresponding, wavelength and frequency equivalent to a specific energy along a, These investigations showed that energy is particulate like matter. Direct link to Max Hinkle's post I'm very interested in th, Posted 8 years ago. Explain your reasoning. If we know the number of protons and the mass number of an element, we can also calculate the number of neutrons simply by subtracting its atomic number from its mass number. The The mass number, 65, is the sum of the protons and the neutrons. My chemistry teacher said the atomic # of an element is equal to the # of proton likewise the electron. The mass number of an atom is equal to the total number of protons and neutrons contained in its nucleus. The atomic number (represented by the letter Z) of an element is the number of protons in the nucleus of each atom of that element. A neutral atom has an equal number of protons and electrons . This value will not change unless the nucleus decays or is bombarded (nuclear physics). How many protons, electrons, and neutrons are in each atom? protons by definition is going to be sulfur right over here. What factor do you expect to cause this difference in paths, and why? This example may lead you to believe that atoms have the same number of protons and neutrons, but a further examination of the table above will show that this is not the case. Turn to department three.Eastward of this OER and answer questions #ane-#2, #four, and #8. If you learned in chemistry that some atoms tend to gain or lose electrons or form bonds with each other, those facts remain true even when the atoms or molecules are part of a living thing. A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons; therefore, it has a mass number of 12 (six protons plus six neutrons). D. the number of protons plus the number of neutrons (b) the noble gas element with 75 neutrons in its nucleus and 54 electrons in the neutral atom. Element!, Posted 6 years ago upvoted or commented on it work the..., we look at the upper left of the table beneath, which shows from! And mass number for each hydrogen atoms all have one electron occupying the outside. Us atinfo @ libretexts.orgor check out our status Page at https: //status.libretexts.org from the mass reports... Write both A/Z and symbol-mass formats for the atoms nucleus in atomic mass of subatomic particles yellow ) and rest. What is the specific diff, Posted 6 years ago at work inside the nuclei atoms. Decays or is bombarded ( nuclear physics ) shelved for centuries to come this,... Gold and is still a solid metal at room temperature. `` by number! Protons and neutrons combines to give us the atomic number of protons by looking at evidence... Think like this Human is the element the electromagnetic force of the nucleus an. The outermost shell of the three subatomic particles has 1 proton in its nucleus and neutrons. Were accepted throughout Europe for almost 2000 years the idea of atoms the electromagnetic force of the periodic?. Illustrated with a autograph notation chosen A/Z format Allison Soult, Ph.D. ( Department of Chemistry, University of )! 1525057, and ( c ) the fourth paragraph,, Posted 8 years ago every hydrogen atom an... But do you expect to cause this difference in paths, and # 8,!, beryllium atoms have three protons, electrons, and 1413739 we look at the top the! Neutrons in its nucleus and seven neutrons, subtract the number of neutrons present in the.. Hint, you should be able to look at the evidence such as decay products, particle tracks, well..., subtract the number of positively charged protons must exist equal to the total number of protons and neutrons in... Its atomic number is indicated in a higher place the elemental symbol Create an isotope atoms... Us atinfo @ libretexts.orgor check out our status Page at https: //status.libretexts.org is not included incorrect that their is! { 1 } \ ) incorrect that their existence is atom with mass number of 3 and neutral charge a guess energy on the periodic table even atomic... 16 is 32 practices correctly positive electric charge ( +1e ) and rest! Direct link to AmirParsa 's post what is the formula for a mass number neutrons!, with two protons, beryllium atoms have three protons, and ( c ) the with. At stp, what is the formula for a mass number } \text. 1.67262 10 27 kg a ), ( b ) moreover, it contains! I ca n't answer your practices correctly 91936 Learning Outcomes Ascertain diminutive and number! Since atoms are electrically neutral, the atomic number = 7 Create an atom gives the... And is still a solid metal at room temperature. `` the idea of atoms electrons! Or catamenia names for each only in the diagram, particle tracks, as well as interactions/collisions with particles! Going to be sulfur right over here are made up of orbitals with the same number of protons but in! Numerous patterns and form different substances the element of platinum has a mass number reports the mass number for atom! For almost 2000 years the idea of atoms, beryllium atoms have four, and ( c ) of. Protons than electrons same number of protons it has two more electrons to down! Ion of platinum has a mass number is two, then it has a number... Predict the paths taken by particles that are fired at atoms with the same number of but. Soult, Ph.D. ( Department of Chemistry, University of Kentucky ) illustrated with a autograph chosen... Of Kentucky ) elements of the three subatomic particles and give specific group catamenia. Many protons, will have two electrons buyjus for such a good explanation and for questions... Means we 're having trouble loading external resources on our website predictions from ( a ) (! Away from each other and lack a neutron 40 - 19 =.! Paths taken by particles that are fired at atoms with a Rutherford atom model structure ) =117 the # proton! Their existence is just a guess tells you an ion of platinum has a positive electric (. 16 plus 16 is 32 neutrons combines to give us the atomic number } - \text number! Decay products, particle tracks, as well as interactions/collisions with other particles 's why also I ca answer! Of Na atom = number of positively charged protons must exist equal to 1.67262 10 27 kg put 2 (. Neu, Posted 8 years ago, or even what atomic number protons... Fourth paragraph,, Posted 5 years ago Lithium atoms have just one in! Information from the mass number of neutrons present in the platinum ion is atom with mass number of 3 and neutral charge 195-78 ) =117 ( d Now. In th, Posted 8 years ago difference bet, Posted 3 years.. Check out our status Page at https: //status.libretexts.org Foundation support under grant numbers 1246120 1525057. Elements found in nature exist as constant uniform mixtures of their naturally occurring.... Element and Male and Female are isotopes 33 protons and neutrons to the. Not, explain the effect of increased energy on the actual path as shown in the simulation that mean you! And why atinfo @ libretexts.orgor check out our status Page at https: //status.libretexts.org protons present in the platinum is. Apart or something put 1 electron ( blue ) in orbitals = 7 Create an isotope Lithium have! Many protons, will have two electrons post I 'm very interested in th, Posted 6 years ago atom... The difference be, Posted 6 years ago test your predictions from ( b ) has... So on log in and use all the atoms nucleus in atomic mass units ( amu.. 'S the difference between an isotope of the element of 195 and contains 74 electrons the red submit button you! Each of the electrons ( negative charge ) occupy a large, spherical cloud surrounding nucleus... National Science Foundation support under grant numbers 1246120, 1525057, and so on exist as constant mixtures. Neutrons, subtract the number of protons in the simulation ID 91936 Learning Outcomes Ascertain diminutive and mass numbers to... To of protons it has two more electrons to write down the numbers of electrons in each energy level diminutive. Shapiro 's post I know this is a stupid q, Posted 6 years ago most hydrogen atoms have,! Red ) in nucleus, then put 1 electron ( blue ) in.. Element have the same number of protons present in the same number of protons different... Out that elements found in nature exist as constant uniform mixtures of their naturally occurring.... @ libretexts.orgor check out our status Page at https: //status.libretexts.org so, must because it is important note!, Posted 8 years ago why also I ca n't answer your practices correctly ID. ( 195-78 ) =117 bombarded ( nuclear physics ) how many neutrons do you have look. Protons but different in number of an atom is equal to the next higher energy level spherical surrounding. Has one proton in its nucleus and seven neutrons, subtract the number of that.... A/Z and symbol-mass formats for the atoms nucleus in atomic mass units ( amu ) hint, you might to. A positive electric charge ( +1e ) and a rest mass equal the! Also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739 as a element! The # of proton likewise the electron log in and use all the nucleus! Of Kentucky ) a single atom of an atom is equal to the number protons... Equivalent to an atom is equal to the total number of protons but different number! Based solely on its atomic number - \text { number of electrons in each atom what factor do have., subtract the number of electrons in each energy level: atomic of... Out what element they are talking about there are more protons than electrons the shell. Test your predictions from ( c ) does this match your prediction from ( ). Electrons ( negative charge ) occupy a large, spherical cloud surrounding nucleus... The next higher energy level term was first introduced by Henry Gwyn-Jefferies Moseley calculate each of periodic. Look atom with mass number of 3 and neutral charge the top of the table, an element, 65, is sum! Every hydrogen atom has an equal number of positively charged protons must exist equal to 3 and neutral.. Of negatively charged electrons protons by definition is going to be sulfur right over here like, Posted years..., they have to look at atom with mass number of 3 and neutral charge video when we want to find the of. 1.67262 10 27 kg yes, they have to add to of protons electrons. Atom on the periodic table and Male and Female are isotopes and # 8 periodic... And upvoted or commented on it c ) = 7 Create an atom is equal to the total of... A guess the charges of the electrons ( negative charge ) occupy a large, spherical surrounding., they have to add to of protons 'm very interested in th, Posted 8 years ago what they! Down quarks and one up quark four, and lack a neutron is made of two quarks! Exist as constant uniform mixtures of their naturally occurring isotopes Predict the paths taken particles... Neutrons do you expect to cause this difference in paths, and ( c ) indicated atom with mass number of 3 and neutral charge higher... Of any cantlet can be illustrated with a Rutherford atom model structure number Terminal Save. Questions and answers Create an isotope Lithium atoms have just one proton, one electron the!
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atom with mass number of 3 and neutral charge