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Unformatted text preview: 2. Use the trends in the periodic table to help determine oxidation number. 3. Deduce other oxidation numbers from other oxidation numbers of elements in the compound or ion. Common Oxidation Numbers: Atom or Ion Oxidation Number Examples all atoms in elemental form. Na (s); Cl 2 hydrogen in all compounds. +1 H in HCl except in hydrides-1 H in LiH oxygen in all compounds-2 O in CO2 except in peroxides-1 O in H2O2 all monatomic ions charge on ion Fe 2+ is +2; Br-is 1 Elements: S 6 Pb O 2 Ionic Compounds: NaCl PbCl 4 SnO 2 Fe 2 O 3 Ions: NO 3-Cr 2 O 7 2-MnO 4-Covalent Compounds: CH 4 H 2 O NH 3 Unusual Cases: MgH 2 K 2 O 2 Carbon: CO CO 2 CO 3 2-CNO-C 2 H 2 CN-...
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- Spring '10