The position of three elements A, B and C in the periodic table are shown below :


Give reasons to explain the following:
(i) Element 'A' is a metal.
(ii) Element 'B' has larger size than 'C'.
(iii) Element 'C' has a valency - 3.

Explanation

(i) Element .A. is a metal because it is present in group I (1 valence electron) and can lose electron easily.
(ii) Element B has larger size than .C. because it has more number of shells than .C..
Also, B lies in the third period and has three shells whereas B lies in second period and has two shells.
(iii) .C. being an element of 3rd group has three valence electrons, therefore its valency is 3.