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Variation of Valency

Accounts for ...

Question

Accounts for the following:
a) Elements C, N, O and F are all placed in the second period in the periodic table.

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Solution

The second period of the perioidc table consists of elements that have electrons in the second shell.
C, N, O and F have 4, 5, 6 and 7 electrons in their second shell and hence are placed in the second period.

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