What is the relationship between the electronic configuration of an element and its valency?

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Solution

In general, the number of electrons in last
shell in electronic configuration determines
the valency of an atom. In simple, Valency is
the number of electron a atom receive or
donate to become stable during chemical
reaction. Valency according to number of
electrons in last shell (valence shell) is as
follows:-

1. Valency list of atom having lor 7
electron in their last shell.

2. Valency 2 is for atom having 2 or 6
electron in their last shell.

3. Valency 3 is for atom having 3 or 5
electron in their last shell.

4. Valency 4 is for atom having 4
electron in their last shell.

But some of the atom also has two or more
valency according to the chemical reaction.
For example: Fe(Iron) has two valency 2 and 3
; Fe203 and Feo.

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