Using oxidation numbers in compounds

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Last updated 5:36 PM on 6/16/26

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Key idea about oxidation number

All of the oxidation numbers of the atoms in a compound must add up to the total charge on the compound

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How is the oxidation number rule shown in water

Water molecule has total charge of zero,

Hydrogen has oxidation number of +1 , but theres 2 hydrogens so +2

Oxidation number of oxygen is -2,

adding -2 and +2 gives us zero, total charge on water molecule.

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What do roman numerals tell us

The oxidation number of the element

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