mkmontana
mkmontana mkmontana
  • 03-02-2021
  • Chemistry
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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

Respuesta :

hhh22267
hhh22267 hhh22267
  • 03-02-2021
2: protons and neutrons
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