Complete the following table using the periodic table.

s - block and p - block elements except 18th group elements are sometimes called as `Representative elements' based on their abundant availability in the nature. Is it justified? Why?

Complete the following table using the periodic table.

The electronic configuration of elements X, Y and Z are given below?

a) X = 2

b) Y = 2, 6

c) Z= 2, 8, 2

i) Which element belongs to second period?

ii) Which element belongs in second group?

iii) Which element belongs to 18th group?

Identify the element that has the larger atomic radius in each pair of the following and mark it with a symbol (3).

(i) Mg or Ca

(ii) Li or Cs

(iii) N or P

(iv) B or Al