Which of the following statements does not describe the structure of an atom? a)inside the nucleus of an atom are protons and neutrons. b)protons are positively charged sub-atomic particles. c)electrons are negatively charged sub-atomic particles. d) most of the mass of an atom comes from the electron cloud. plllz guys i really need with this in five mins tops i will rate brainiest, medal, and do anything u need just plz