ColaamaBrainbobbyk ColaamaBrainbobbyk
  • 07-04-2017
  • Chemistry
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The sum of the numbers of protons and neutrons in a nucleus of an atom answer

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smellykat
smellykat smellykat
  • 07-04-2017
An atom's mass number is the sum of the numbers of protons and neutrons in its nucleus. The atomic weight is the average mass of all of the isotopes of that element.
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