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OpenStudy (anonymous):
The atomic mass of an atom equals the sum of the masses of the _____. a) protons and electrons b) electrons and neutrons c) protons and neutrons d) protons only
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OpenStudy (ipwnbunnies):
Protons and neutrons. They have about the same mass. Electrons aren't included in the atomic mass b/c their mass is insignificant compared to protons and neutrons.
OpenStudy (anonymous):
Protons and neutrons
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