Q. 74.0( 4 Votes )

Account for the following:

a. Cations are smaller in size than the corresponding atom.

b. The noble gases were discovered very late.

Answer :

(a) Cations are smaller than corresponding atom because cations have less number of electrons as compared to corresponding atom but both have same number of protons. So the attraction of nucleus on valence electrons become strong in cations than corresponding atom.


(b) Because most elements discovered through their reactivity with other elements like oxygen but it was difficult for scientists to work with a substance that has no chemical properties due to lack of reactivity.


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