An atom of an element has 10 protons. What is also true of that atom? A. It has 10 electrons. B. It has 10 isotopes. C. It has 10 neutrons. D. It has 10 ions.

The answer is A. It has 10 electrons. Most atoms have a neutral charge. Protons and electrons make up the charge of an atom. A neutral charge means that the protons and electrons = the same amount. So your atom has 10 protons and 10 electrons