How does valency vary across a group or period? And why?

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Solution

Valency depends upon the number of electron present in outer most shell of an orbital. Therefore in group it remain constant but across period it is as follows
Group
1
2
3
4
5
6
7
Valency
1
2
3
4
3
2
1

d- block element is not included in it as it shows variable oxidation state.

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How does valency vary across a group or period? And why?

Valency depends upon the number of electron present in outer most shell of an orbital. Therefore in group it remain constant but across period it is as followsGroup1234567Valency1234321 d- block element is not included in it as it shows variable oxidation state.

Valency depends upon the number of electron present in outer most shell of an orbital. Therefore in group it remain constant but across period it is as follows
Group
1
2
3
4
5
6
7
Valency
1
2
3
4
3
2
1

d- block element is not included in it as it shows variable oxidation state.