TheCelloAlex7376 TheCelloAlex7376
  • 16-09-2018
  • Chemistry
contestada

How many neutrons does a beryllium atom with four protons and a mass number of nine?

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KoOTz
KoOTz KoOTz
  • 16-09-2018
neutrons=mass number-protons
=9-4=5
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