CHM 2045 Lecture Notes - Photon, Pauli Exclusion Principle, Work Function

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Two or more elements in whole number ratios: a. The repeating groups of atoms in compounds: b. ionic compounds do not have molecules, a. Simplest whole number ratio of atoms in a compound: a. Representative of all the elemental atoms in a molecule: a. Named after their cation or anion, e. g. copper (ii) ion: b. monatomic anions = ide, e. g. hydroxide, c. polyatomic ions = ite or ate, e. g. no2- = nitrite and no3- = nitrate, molecular compounds, a. If name ends in ide, it starts with hydro and ends in ic, e. g. hydrosulfuric acid: b. If an oxyacid, more oxygens = ic and less oxygens = ous: a. Name begins with element farthest left and down, may get prefix: c. second element gets the ide, d. ex: dinitrogen tetroxide, n2o4, a. Maintains the molecular structure: b. ex: melting, evaporation, dissolution, rotation of light, a. molecular structure changes, b. ex: combustion, metathesis, redox, a.

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