Q.

The noble gas element with least positive electron gain enthalpy value is

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a

He

b

Ne

c

Ar

d

Xe

answer is A.

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Detailed Solution

Due to stable configuration, noble gases have positive electron gain enthalpy values;Positive ∆Heg of  Ne>Ar=Kr >Xe>Rn >He
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The noble gas element with least positive electron gain enthalpy value is