BIOL 1001 Chapter : Biology Notes Ch 2

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15 Mar 2019
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Element: defined by number of protons = atomic number, has specific physical and chemical properties, can"t be broken down by chemical reactions. Electrons fill the shell closest to the nucleus and then begin to occupy the next shell. A molecule consists of 2 or more atoms. A compound is a molecule composed of a mixture of different atoms. Bonding involves electrons: one pair electrons per bond, outer electrons form bonds, behave using octet rule . Force of attraction between atoms that holds them together as a molecule. Ionic: attraction between ions: covalent: electrons shared, polar: shared unequally, nonpolar: shared equally, hydrogen: weak attraction between two molecules made from polar covalent bonds. Ionic bonding in nacl: sodium has 1 electron in outer shell; chlorine has 7, sodium can lose 1 electron; chlorine can gain 1 electron. Sodium becomes a positive ion; chlorine a negative ion: covalent bonds. Nonpolar no charged surface: prefer uncharged molecules, soluble in oils, hydrophobic water hating.

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