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) N (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
This is the end of the preview.
access the rest of the document.
electro negativity, CO2 NOX N2, Greenhouse Gases CO2, atomic mass Greenhouse, Organized elements Wohler