Answer:
Explanation:
The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40
The answer is B.20
that's the correct answer
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Answers & Comments
Answer:
what is the mass number of the atom?
B.
Explanation:
The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40
The answer is B.20
Explanation:
that's the correct answer