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 ‘T’ in the sequence is

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Either 1 or 2

answer is D.

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Detailed Solution

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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