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The atomic mass is the

number of protons plus the number of neutrons
O number of protons plus the number of electrons
O number of neutrons
O number of protons

User Jsnow
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1 Answer

5 votes

Answer:

Number of protons plus the number of neutrons.

Step-by-step explanation:

Most of an atom's mass is in its nucleus. The nucleus is made up of protons and neutrons.

User FlappySocks
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