Question

neutral atoms of all isotopes of a given element have the same ______. answer: a number of protons and neutrons. b number of neutrons. c number of electrons. d mass numbers. e masses.

Explanation:

Isotopes of an element have the same number of protons. In neutral atoms, the number of electrons equals the number of protons. So, neutral atoms of all isotopes of a given element have the same number of electrons. Neutrons vary among isotopes, so mass - numbers and masses also vary.

Answer:

C. number of electrons