varevalo823 varevalo823

16-10-2020
Chemistry

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An atom of beryllium has 4 protons, 4 electrons, and 5 neutrons. What is its mass number?

An atom of beryllium has 4 protons 4 electrons and 5 neutrons What is its mass number class=

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jeremiahkevinm jeremiahkevinm

16-10-2020

Answer:

D. 9.

Explanation:

Mass number of an atom is the sum of the proton number and neutron number. For Be, the protons are 4 and neutrons are 5. So, we get 9 by adding them.

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