In the following table, the positions of six elements A, B, C, D, E and F are given as they are in the Modern Periodic Table :

On the basis of the above table, answer the following questions :
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of B and C, whose atomic radius is bigger and why?
(v) Write the common name for the family to which the elements D and F belong.

Explanation

(i) E
(ii) B
(iii) C
(iv) B, because atomic radius decreases from left to right due to increase in the nuclear charge.
(v) Noble gases.