1.

In which of the following groups, when He is placed, its all the properties are satisfied(a) with alkali metals (b) with halogens (c) with inert gases (d) None of these

Answer»

 (c) The differentiating electron enter in s subshell in case of He, hence it is s- block element. Its electronic configuration ls2 makes it inert in nature hence it is placed with inert gases



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