hightop9904 hightop9904

30-11-2022
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Choose the correct definition of an atom's atomic mass number.
An atom's atomic mass number is the number of protons plus the number of neutrons.
An atom's atomic mass number is the number of protons plus the number of electrons.
An atom's atomic mass number is the number of electrons plus the number of neutrons.
An atom's atomic mass number is the number of particles.

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