joesiegcorona joesiegcorona
  • 10-06-2020
  • Chemistry
contestada

What is the mass number of an atom that contains 19 protons, 19 electrons, and 20 neutrons?

Respuesta :

alry9 alry9
  • 10-06-2020

Answer:

39

Explanation:

Total protons + total neutrons = mass number

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