The position of 3 elements A, B and C in the Periodic Table is shown b

1.	The position of 3 elements A, B and C in the Periodic Table is shown below: Giving reasons, explain the following: (a) Element A is a non-metal. (b) Atom of element C has larger size than A. (c) Element B has a valency of 1.
Answer» (a) A belongs to 7th group, has 7 valence electron, it can gain 1 electron to become stable. So it is a non-metal as it forms negative ion. (b) ‘C’ has 3 shells ‘A’ has 2 shells so C is bigger than A. (c) ‘B’ has one valence electron, it can loose this electron to become stable. So its valency is 1.

The position of 3 elements A, B and C in the Periodic Table is shown below: Giving reasons, explain the following: (a) Element A is a non-metal. (b) Atom of element C has larger size than A. (c) Element B has a valency of 1.

Answer»

(a) A belongs to 7th group, has 7 valence electron, it can gain 1 electron to become stable. So it is a non-metal as it forms negative ion.

(b) ‘C’ has 3 shells ‘A’ has 2 shells so C is bigger than A.