Question

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

Group 16	Group 17
--------------	------------
--------------	A
--------------	------------
B	C

(a) State whether A is a metal or 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 ?

Answer 1

(a) Since the valency of group 17 elements is 1 and all these elements accept electrons, thus A is a non-metal.
(b) C is less reactive than A because as we move down in a group, the reactivity of non-metals decreases.
(c) C is smaller in size than B because B and C both are related to the same period and the size decreases as one moves from left to right in a period.