JEE Advanced Chemistry question

Statement 1: All the noble gases have ns2np6 electronic configuration in their outermost shell Statement 2: In noble gases all the energy levels which are occupied are completely filled

(A)Assertion is True, Reason is True; Reason is correct explanation for Assertion
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is TrueCorrect

Answer: (D)

Solution

The claim that "all" noble gases have an ns2np6 outer configuration is false, because helium, the first noble gas, has only the configuration 1s2 — there is no 1p subshell at all for n = 1, so helium cannot have an np6 component. Statement 2, however, is true and general: in every noble gas,

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Question ID VK-159295