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The mass number of an atom is determined by ___. 1.adding the protons and electrons 2.adding the protons and neutrons 3.adding the electrons and neutrons 4. adding the protons,electrons and neutrons
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The mass number of an atom is determined by ___.

1.adding the protons and electrons
2.adding the protons and neutrons
3.adding the electrons and neutrons
4. adding the protons,electrons and neutrons

User Ken Colton
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4 votes

Answer:

2

Step-by-step explanation:

User Tomsgd
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