The following table shows the position of five elements A, B, C, D and E in the modern periodic table.

Answer the following giving reasons:
(i) Which element is a metal with valency two?
(ii) Which element is least reactive?
(iii) Out of D and E which element has a smaller atomic radius?

Explanation

(i) D, As it is on the left side of the table in group 2
(ii) C, as it is in the group 18/ Noble gas
(iii) E, as we move from left to right across a period, atomic radius decreases