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Q.

Statement-I: Helium is a s-block element as per definition

Statement-II: Electronic configuration of thorium is [Rn] 7s26d15f1          

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a

I & II are incorrect

b

I is incorrect, II is incorrect

c

I & II are correct

d

I is correct, II is incorrect

answer is C.

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Detailed Solution

 Electronic configuration of thorium is [Rn]86 7s26d25f0

I is correct, II is incorrect

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Statement-I: Helium is a s-block element as per definitionStatement-II: Electronic configuration of thorium is [Rn] 7s26d15f1