Which of the following statements about atoms is FALSE? A. They are mostly empty space. B. Nearly all their mass is concentrated in the nucleus. C. In a neutral atom protons and electrons are equal in number. D. The nucleus contains equal numbers of protons and neutrons.
Option D. The nucleus contains equal numbers of protons and neutrons is false statement because for the elements with smaller atoms, usually this is true, but for heavier elements it is not.
