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P, T, Y, X, Q and E are the elements belonging to 18th group of Modern periodic table. The correct trend of positive gain enthalpy in these elements is P > T = Y > X > Q > E. The element ‘P’ in the sequence is

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a
Kr
b
Ar
c
He
d
Ne

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detailed solution

Correct option is D

Atomic radius….HeNe>Ar>Kr>Xe>Rn;Positive electron gain enthalpy ….Ne>Ar=Kr>Xe>Rn>He;Due to stable configurationMP and BP…..HeNe>He>Kr>Xe;

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