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ATOM QUIZ REVIEW You need to know the five people that we talked about and their contribution the development of the atom. Democritus – first person to use the word ATOM John Dalton – experiments led to everybody agreeing that there are atoms. Came up with Dalton’s Atomic Theory. All elements are composed of atoms. Atoms are indivisible and indestructible particles. (not true because there are smaller parts within the atom) Atoms of the same element are exactly alike. Atoms of different elements are different. Compounds are formed by the joining of atoms of two or more elements. J.J. Thomson – discovered electrons. Plum Pudding model of the atom Ernest Rutherford – discovered the positively charged nucleus of the atom by doing the gold foil experiment. He fired positively charged radiation at a sheet of gold foil. Most went straight through, some bounced straight back. Bohr – electrons orbited nucleus; protons and neutrons in the nucleus We then looked at isotopes, which are atoms of the same element that have the same number of protons but a different number of neutrons. 12.01 C 6 1. CARBON: C - 12 protons = C-14 6 protons = 6 electrons = 6 electrons = 6 neutrons = 6 neutrons = 8