the total number of protons and neutrons in a nucleus.
All atoms have at least one proton in their core, and the number of protons determines which kind of element an atom is. ... Electrons are usually depicted in drawings as much smaller than protons or neutrons because their mass is so much smaller. In fact, electron mass is so small that it is not counted in an atom's mass.
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Answer:
the total number of protons and neutrons in a nucleus.
All atoms have at least one proton in their core, and the number of protons determines which kind of element an atom is. ... Electrons are usually depicted in drawings as much smaller than protons or neutrons because their mass is so much smaller. In fact, electron mass is so small that it is not counted in an atom's mass.
Explanation:
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