Moisesp345 Moisesp345
  • 02-10-2020
  • Chemistry
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What is the mass number of the atom shown?

What is the mass number of the atom shown class=

Respuesta :

legoshes
legoshes legoshes
  • 02-10-2020

Answer:

21

Explanation:

Formula;

Mass number = number of protons + number of neutrons

= 9 + 12

= 21

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