Fill in the blanks by picking the correct option there are_____groups and_______periods in the extended form of periodic table.The group,all members of which are in gaseous state under ordinary condition is_______group.Most electropositive elements belongs to_____group.
A. 16,8.17,2
B. 18.7,18,1
C. 8,7,0,2
D. 16,8,18,1
