Question

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

Answer 1

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.

Answer 2

16

Step-by-step explanation:

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