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Question

Helium's subshell electron configuration is 1s2. But why helium not included on S Block elements?

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Solution

Helium's chemical properties are more similar to the p-block noble gases due to its full shell. It is a stable element and does not take place in the chemical reaction similar to the noble gases like Neon, Argon etc. which are there in the p block. So, even if Helium has the electronic configuration of 1s2 , it is not included with the s block elements.

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