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1) Dalton 2a) A green "glow" of light 2b) That green "glow" was not light (since it bend direction when exposed to magnet) but a negative particle (moved away from negative end of magnet) coming out the metal (represents an atom). We call them electrons. 2c) Plum pudding model 2d) The "plum" are the electrons (negative circles/spheres) with everything else being positive. 3a) Rutherford, nucleus 3b) Rutherford "shot" a bullet (actually positively charged alpha particle) thru gold leaf that was inside an "egg" with inside surface of egg coated so that you could see where alpha particle hit it. 3c) There is a high mass, small volume, positively charge center called nucleus and rest of atom is empty space where electrons reside. 4a) Movement/pathway of electrons (e-). 4b) Energy levels 4c) Electrons move (revolve) in energy levels like planets around the Sun. 4d) Planetary model 4e) Nucleus (positively charged, high mass, small volume center), electrons outside nucleus rest of volume of atom empty space. 4f) That electrons (in energy levels) revolve around nucleus like planets around Sun. 5a) All electrons are in the LOWEST AVAILABLE ENERGY LEVELS. 5b) Absorb a discrete (specific) packet size of energy 5c) Excited state of atom Def: NOT all electrons are in the LOWEST AVAILABLE ENERGY LEVELS in atom Energy is emitted (goes out of atom) from atom 5e) Atom is back in the Ground State 5f) Nothing (atom does absorb any discrete packet size of energy. |