The position of three elements A, B and C in the Periodic Table is shown below:Giving reasons, explain the following:(i) Element A is a metal.(ii) Element C has larger size than element B.(iii) Element B has a valency of 3.

The position of three elements A, B and C in the Periodic Table is sho

1.	The position of three elements A, B and C in the Periodic Table is shown below:Giving reasons, explain the following:(i) Element A is a metal.(ii) Element C has larger size than element B.(iii) Element B has a valency of 3.
Answer» (i) Element A belongs to group I of the Periodic Table. So, it has I valence electron and it forms unipositive ion by losing its valence electron. Hence, A is a metal. (ii) This is because element C is in third period while element ts is in second period. We know,that the atomic size increases down the group and decreases along a period. (iii) Element B is in 2nd period and 3rd group hence it has 3 valence electrons. It loses 3 electrons to achieve nearest inert gas configuration. So, its valency is 3.