Q8 of 28 Page 28

Write the names from the description.
The group with valency zero.

Group-8 (Noble gases)

In the noble gases, there are no valence electrons present. The atoms of the noble gases have noble gas configuration as shown below in the table:

Write scientific reasons.

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

Write the names from the description.

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

Write the names from the description.

The family of nonmetals having valency one.

Write the names from the description.

The family of metals having valency one.

Questions · 28

2. Periodic Classication of Element

1 2 3 4 4 4 4 4 4 4 4 5 6 6 6 7 7 7 7 7 8 8 8 8 8 8 8 8

Write the names from the description.The group with valency zero.