Q8 of 28 Page 28

Write the names from the description.

The period with electrons in the shells K, L and M.

Third period


It is given that the electrons are present in shells K,L and M. This means there are total three shells present. Thus, third period is having elements which are electrons present in K,L and M.



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7

Write scientific reasons.

Elements belonging to the same group have the same valency.

 7

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The third period contains only eight elements even through the electron capacity of the third shell is 18.

 8

Write the names from the description.

The group with valency zero.

 8

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The family of nonmetals having valency one.