The position of three elements A, B and C in the Periodic Table are shown below: (a) State whether A is a metal or a non-metal.(b)State whether C is more reactive or less reactive than A.(c) Will C be larger or smaller in size than B?(d) Which type of ion-cation or anion will be formed by element A?

The position of three elements A, B and C in the Periodic Table are sh

1.	The position of three elements A, B and C in the Periodic Table are shown below: (a) State whether A is a metal or a non-metal.(b)State whether C is more reactive or less reactive than A.(c) Will C be larger or smaller in size than B?(d) Which type of ion-cation or anion will be formed by element A?
Answer» Solution :(a) Metals lie on the LEFT-hand side of the PERIODIC Table whereas non-metals are FOUND on the right-hand side. The element A is in group 17. Group 17 is on the right side of the PeriodicTable. Thus, element A is a non-metal (called halogen). (B)The chemical reactivity of non-metals decreases on going down in a group. In group 17, thechemical reactivity decreases on going down in a group. So, element C is less reactive than A. (c) The atomic size decreases in moving from left to right along a period. So, atom C will be smaller in size than B. (d) The element A of group 17 has 7 valence electrons. So, it will gain one electron to form anegatively CHARGED ion `(A^-)` . The negatively charged ion is called an anion. So, element A will form an anion.