Whats the mass of an atom that has 4 protons, 4 neutrons, and 4 electrons

Atomic mass is equal to the number of protons and neutrons. Electrons have so little mass that they are practically negligible.

Atomic mass = 4+4 = 8 AMU

The atomic mass would be 8 ...

Explanation:

which means the substance is is 8 beryllium, which is an unstable isotope of beryllium : the stable isotope is the one that contains 4 protons and 5 neutrons.

The number of electrons would be 4, and as this atom there is no overrall charge.

An overrall charge would only occur if one or more electrons were lost.

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