Diffusion - The spontaneous spreading out of particles to fill all available space, Atoms - Smallest building blocks of all matter , Element - Substance which cannot be broken down into anything simpler by chemical means, Law of Conservation and Mass - The mass of a closed system will remain constant, regardless of the processes acting inside the system, Protons - Positively charged sub-atomic particles, Electrons - Negatively charged sub-atomic particles, Neutrons - Uncharged sub-atomic particle , William Crookes - Attempted to discover what was happening in a cathode ray tube, JJ Thomson - Investigated composition of cathode rays , George Stoney - Came up with the name of the electron, Robert Millikan - Designed an oil experiment to determine the size of the charge of the electron, Plum Pudding - Sphere of positive charge with negative charged electrons embedded randomly,

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