The gas argon does not take part in chemical reactions. What do you think is its valency?
The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :
(a) nitrogen, oxygen, argon (b) nitrogen, argon, oxygen
(c) argon, oxygen, nitrogen (d) oxygen, argon, nitrogen
The number of valence electrons in argon (Z=18) is