2) element that is a liquid at STP is mercury (Hg) . it belongs to IIB group . hence option D is correct. 6) iodine is halogen hence option a is correct 8) iodine has the least tendency to accept electrons . iodine has the least electron affinity among the halogens hence option b is correct Solution 2) element that is a liquid at STP is mercury (Hg) . it belongs to IIB group . hence option D is correct. 6) iodine is halogen hence option a is correct 8) iodine has the least tendency to accept electrons . iodine has the least electron affinity among the halogens hence option b is correct.