Beryllium has four protons in its nucleus. how many neutrons are in beryllium-9? explain how you calculated your answer

The answer to your question is: 5 neutrons

Explanation:

Beryllium has 4 protons

# of neutrons in beryllium-9

Atomic number (Z) = 4 (number of protons)

Mass  number (A) = 9 (number of protons + neutrons)

                          Mass number = number of protons + number of neutrons

                          9   = 4 + number of neutrons

                          neutrons = 9 - 4

                          neutrons = 5

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