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3) The atomic number of magnesium is 12. This means that its nucleus must contain

A) 6 protons and 6 neutrons.
B) 6 neutrons and 6 electrons.
\C) 12 neutrons and no protons.
D) 12 protons and no electrons.

Answer :

A) 6 protons and 6 neutrons
thunderkirby12ovvpmn

The answer is D. 12 protons and no electrons.

The nucleus is the center of an atom that contains protons and neutrons. Electrons are located AROUND the nucleus in energy levels, not in the nucleus.

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