Question

which does no belong to group 18!
(a) He (b) k (c) ar​

Answer 1

Answer:

ar -argon is the answer pls follow me

Answer 2

Answer:

k

Explanation:

k( potassium) has atomic number 19,

and its electronic configuration is 2,8,8,1

as it has valence electron,it can't be in group 18

because, as we know the property of group 18 is that they are noble gases they don't have any valence electron