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Oxidation Number or Oxidation State

Oxidation Number or Oxidation State - Sulphur in S-2 is-2...

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Oxidation Number or Oxidation State The oxidation number is defined as a positive or negative number that represents a charge that an atom appears to have in a given species when the bonding electrons are counted as per the prescribed set of rules. Rule 1 : The oxidation number of an atom in an element in its free uncombined state is zero. Rule 2 : The oxidation number of a monoatomic ion is same as the charge on the ion. The oxidation number for the Calcium ion is +2 and that of
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Unformatted text preview: Sulphur in S-2 is -2 Rule 3 : Oxidation numbers conventionally assigned to atoms in their chemical compounds are as follows: a) Oxygen = -2 ( except in peroxides -1)b) Hydrogen = +1 ( except in metallic hydrides -1 )c) Group IA elements ( alkali metals ) = +1 d) Group IIA elements ( alkaline earth metals ) = +2e) Halides = -1 Rule 4 : The algebraic sum of positive and negative oxidation numbers in compound is zero....
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