AQA AS Chemistry - Rules For Oxidation Numbers (states)

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Rules for Oxidation Numbers
Rule 1:
ALL elements are zero
Rule 2:
For a simple ion the oxidation number is the charge on the ion.
A roman numeral is always a + charge.
E.g.
Rule 3:
Hydrogen in a compound is always +1 unless its in a metal hydride when it is a 1.
NaH ­ H = 1
Rule 4:
Oxygen in a compound is always ­2 unless in a peroxide. E.g. H2O2 when its 1 or
OF2 when its +2
Rule 5:
The more electronegative elements have ­ (minus) values and more electropositive
elements have + (plus) values ­ When in a compound.
Rule 6:
In a compound, the sum of the oxidation numbers must equal Zero 0.
Rule 7:
The sum of the oxidation numbers must equal the charge of the ion.

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