Question

give reasons why gaseous elements were discovered quite late as compared to solid elements​

Answer 1

Answer:

The elements are Helium, Neon, Argon, Krypton, Xenon and Radon. 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 .

Answer 2

Explanation:

(i) Most of the noble gas elements are not present in earth crust as minerals like other elements and are present in air to a very small extent. (ii) Their atoms have stable electronic configuration of their outermost shells also called valence shells. ... That is why noble gas elements were discovered at a later stage.

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