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25-08-2022
Chemistry

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Beryllium has an atomic number of 4. How many neutrons does the isotope beryllium-9 have?.

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egled1997 egled1997

25-08-2022

Answer: 5 neutrons

Explanation:

atomic number - number of protons in the nucleus

beryllium has mass number 9

mass number = number of protons + number of neutrons

9 = 4 + number of neutrons

number of neutrons = 9-4 = 5

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