Which of the following statements about the atom is false? a. Each atom has a tiny nucleus at its center. b. All the protons and neutrons are located in the nucleus. c. Electrons travel in definite circular pathways around the nucleus. d. All atomic nuclei are positively charged.

The false statement is C. According to the Heisenburg uncertainty principle, which inspired the modern 'Electron Cloud' model of the atom, it is nearly impossible to predict an electron's path around the atom. The model statement C is referring to is the Neils Bohr model of the atom, which is useful, but inaccurate.