Question

write two reasons responsible for late discovery of noble gases\

Answer 1

Reasons for late discovery of noble gases:

1) They are incapable of reacting with other elements. Being inert, they are not present in combined form with other elements.

2) They are minor components of air, that is, present in only trace amount

Hope it helps you .

Answer 2

Answer:

a. They are inert i.e., least reactive.

b. They are less abundant in nature except for Argon.