11 - atomic elements: (metals, noble gases) exist as single...

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Dr. Skibo: chemistry lab coordinator Email: caskibo@gmail.com (213) 740-8265 mole (mol) = the number of atoms in exactly 12 g of C-12 relates any quantity at the atomic scale to its corresponding macroscopic scale 1 mol = 6.02214 x 10^23 particles (avogadro’s number) mass moles number of atoms with mass of a pure compound we can find the number of atoms in the samples and vice versa atomic mass = average mass of an atom and the mass in grams of 1 mole of an atom most expensive stable elements 1. Rhodium 2. platinum 3. gold 4. palladium ionic bonds form due to electron transfer; ions are attracted by electrostatic forces covalent bonds form by sharing of electrons
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Unformatted text preview: atomic elements: (metals, noble gases) exist as single atoms molecular elements: the same element covalently bound to itself diatomic: Br, I, N, CL, H, O, F P4, S8, Se8 Molecular compounds have greater than or equal to two covalently bound nonmetals Ionic compounds are composed of cations and anions Binary Ionic Compounds (metal + nonmetal) the metal only forms 1 cation; if metal forms more than one cation it requires a Roman numeral Binary Covalent Compounds (nonmetal + nonmetal) Binary Ionic Compounds I 1. cation is named first 2. the cation has the same name as its parent element 3. name the anion as: (parent element root + (-ide))...
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This note was uploaded on 04/03/2012 for the course CHEM 105A taught by Professor Bau during the Fall '04 term at USC.

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