Chemistry VALENCE OR OXIDATION NUMBER

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VALENCE OR OXIDATION NUMBER

Oxidation State :

Except the `IA` and `IIA` group elements all the other elements shows variable oxidation state. `IA` & `IIA` group elements show `+1` and `+2`
state respectively.

Valency :

`IA` & `IIA` group element shows `+1` and `+2` electron valency. While most of the other group element shows variable valency. The `VIIA` group elements shows `-1` electrovalency and one co-valency. The variable co-valency of `p`-block elements from top to bottom down the group varies as

(i) Co-valent state change in to electrovalent.

(ii) Stability of higher valent state decrease while that of lower valent state increase.