Electrons - negatively charged subatomic particles, Atomic number - number of protons in an atom of an element, Neutrons - neutrally charged subatomic particles, Atom - smallest part of an element, Protons - positively charged subatomic particles, Periodic Table - collection of elements, Elements - made up of one type of atom only, Atomic mass number - number of protons and neutrons in an atom of an element, Diffusion - the spontaneous spreading out of particles to fill all the available space, Law of Conservation of Mass - the mass of the reactants must equal to the mass of products, Daltons Atomic Theory - all matter is made up of very small particles called atoms, William Crookes - discovered cathode rays, J.J. Thomson - discovered electron, Professor George Stoney of Galway - suggested the name electron, e/m - the ratio of the size of the charge of the electron to its mass, Robert Millikan - determined the size of the charge of the electron, Thomson's Plum Pudding Model of the Atom, Most alpha particles pass straight through the gold foil - Most of the atom is empty space, Some alpha particles are deflected at large angles - The alpha particles are repelled when they pass near the small positive nucleus, A small number of alpha particles are reflected back along their own paths - The alpha particles collide head on with the nucleus, Structure of atom proposed by Rutherford, James Chadwick - discovered neutrons,

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