Question

Scientific reason the Valency changes in a period. ​

Answer 1

Answer:

In each period, only one electron will be added in same outer most shell as we move from left to right. So Atomic number changes. Electronic configuration changes hence the reactivity of the elements changes hence valency also changes

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Answer 2

In each period, only one electron will be added in same outer most shell as we move from left to right. So Atomic number changes. Electronic configuration changes hence the reactivity of the elements changes hence valency also changes.

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