Question

Write two reasons responsible for late discovery of noble gases.

Answer 1

Explanation:

The common thing with the noble gases is that they have full outer shells, and don't react with any elements. Noble gases were discovered later than other elements , simply because they were extremely unreactive . Being intert they were difficult to isolate via chemical reactions

Answer 2

Answer:

the reasons behind late dicovery of Noble gases are

1. their occurrence in the atmosphere is approx. 1%
2. they are chemically unreactive and mostly found in radioactive materials