X' is most inert element and 'Y' is most reactive element in the long form of the periodic table. 'X' and 'Y' are respectively

X' is most inert element and 'Y' is most reactive element in the long

1.	X' is most inert element and 'Y' is most reactive element in the long form of the periodic table. 'X' and 'Y' are respectively
Answer» H, F. He, F He, Cs Xe,F Answer :B