Complete the following table using the periodic table.

Elements in a group generally possess similar properties, but elements along a period have different properties. How do you explain this statement?

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?