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What is the total number of protons and neutrons in the nucleus of an atom?

Answer 1

Well, to a good approximation it is the mass of that atom.

Protons and neutrons are massive particles. The combined number of #"protons"# and #"neutrons"#, of #"nucleons"#, constitute the mass of the atom. The #"electrons"#, while they do all the chemistry, are along for the ride, and do not make much contribution to the atomic mass. Certainly from a chemical perspective, their mass is negligible. From a physical perspective you will have to ask on the other forum.

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Answer 2

Axel Alvarado

mass number of an atom.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.