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A carbon atom has a mass number of 12. How many protons and how many neutrons does it have?

Md Ariful Islam

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Md Ariful Islam

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You specified a carbon atom. By definition, the $C$ atom has 6 protons, 6 positively charged nuclear particles, in its nucleus. You further specified the $""^12C$ isotope. There must be 6 neutrons, 6 neutrally charged, massive particles in its nucleus.

If it's a carbon atom, the number of protons cannot change (why not?), but the number of neutrons in the nucleus can vary. $""^13C$, and $""^14C$ are known. How many neutrons does each nuclide possess?

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