CAS CH 102 Lecture Notes - Lecture 17: Plum Pudding Model, Atomic Nucleus, Atomic Number
Document Summary
Thomson saw that electrons contribute only a very small fraction of an atom"s mass they probably were responsible for an equally small fraction of the atom"s size. He proposed that the atom consisted of a uniform positive sphere of matter in which the electrons were embedded like raisins plum pudding model. Rutherford"s gold foil experiment n: the modern view of atomic structure. Electronic charge are the two quantities stated above. Every atom has an equal number of electrons and protons, so atoms have no net electrical charge. Protons and neutrons in nucleus of atom. Vast majority of atom"s volume is space where electrons reside. Use atomic mass unit (amu) to express the mass. Most atoms have atoms b/w 1 x 10-10 m and 5 x 10-10 m. Angstrom is used for atomic dimensions where 1 = 1 x 10-10 m atoms have diameters b/w 1-5 .
