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Fluorine is always -1 with another element
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Oxygen is -2 except when forced to be -1 or -1/2
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Hydrogen is a +1 in molecules and -1 in ionic compounds
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Halogens are generally -1 unless with oxygen or a stronger halogen
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elements that are ions in ionic compounds have ox #’s equal to their charge
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Lone elements have an ox # equal to their charge
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Diatomic molecules are 0
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Sum of all ox #’s in a compound = the charge of the compound