Question

write two reasons responsible for late discoverey of noble gases?

Answer 1

reasons responsible for late discovery of noble gases are
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1)they are not available in abundance , in the atmosphere they are less

2)they wont react with other elements , and are inert so they are not even present in form of compounds

Answer 2

Two reasons responsible for late discovery of noble gases are:-

i) Noble gases are available in extremely low concentrations in our atmosphere.

ii) They are very inert (chemically inactive).