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Chemistry Review Sheet

Chemistry Review Sheet - HISTORY Began in Greece Plato's...

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H (2.1) ELECTRO NEGATIVITY : a relative measure of an atom’s attraction for electrons. Higher  the number, tighter the hold of electrons He (0) L (1.0) Be (1.5) B (2.0) C (2.5) (3.0) O (3.5) F (4.0) Ne (0) Na (.9) Mg (1.2) Al (1.5) Si (1.8) P (2.1) S (2.5) Cl (3.0) Ar (0) HISTORY Began in Greece Plato’s Bounding Triangle Theory Democritus: 1 basic shape, end  point is the “atoma” Alchemy societies hid from the  church. 4 Principles : Unity of the  four basic elements / All elements  had a soul // Transmutation  (universal medicine) //  PEOPLE TO KNOW Dalton : Atomic Theory. Valence Theory (hook on the atoms).  Atomic weight, atoms= hard spheres. Faraday : Electricity can cause reactions, be produced by them and  everything is made up of it Mendeleyev:  Organized elements Wohler     :     “Created life”  Mosely : Cathode ray, found Proton Rutherford : Gold foil, atom mostly empty space, mini solar system
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