Question

An atom has 4 protons 4 neutrons, and 4 electrons. This atom has a mass number of

Answer 1

Answer:

16

Explanation:

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Answer 2

Its nucleus also contains two neutrons. Since 2 + 2 = 4, we know that the mass number of the helium atom is 4. Finally, the helium atom also contains two electrons since the number of electrons must equal the number of protons.