The number of electrons that move about the nucleus of an electrically neutral atom is the same as the number of ____________________. A) protons in the nucleus.B) quarks in the nucleus.C) protons + neutrons in the nucleus.D) neutrons in the nucleus.E) None of these

One electron per proton.

To determine the answer to this question, we need to recall some basic knowledge about atomic structure.

An electrically neutral atom has a balanced charge, meaning it has an equal number of protons and electrons. This is because protons carry a positive charge, while electrons carry a negative charge. In an electrically neutral atom, the positive charge of the protons cancels out the negative charge of the electrons.

Therefore, the number of electrons that move about the nucleus of an electrically neutral atom is the same as the number of protons in the nucleus. So, the correct answer is A) protons in the nucleus.