The first (IE1) and the second (IE2) ionization enthalpies in (kJ mol-1) of three elements I, II, III are given below:
I II III
IE1 403 549 1142
IE2 2640 1060 2080
Identify the element which is likely to be
(a) a non-metal
(b) An alkali metal
(c) An alkaline earth metal