Rules continued

• The position of the element in the periodic table may be useful:a. Group IA (1) elements have oxidation numbers of +1 in their compounds.b. Group IIA (2) elements have oxidation numbers of +2 in their compounds.c. Group VIIA (17) elements have oxidation numbers of -1 unless combined with oxygen or a halogen closer to the top of the group.d. In binary compounds, Group VIA (16) elements have oxidation numbers of -2, unless combined with oxygen or halogens.

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