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Q.

Nobel gas element (X) is having highest positive electron gain enthalpy in it's group. The outer electronic configuration of element (X) is 

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a

1s2

b

3s23p6

c

5s25p6

d

2s22p6

answer is D.

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Detailed Solution

Nobel gas elementElectron gain enthalpy(kJ/mole)
He+48
Ne+116
Ar+96
kr+96
Xe+77
Rn+68

Neon (Ne) has the highest electron gain enthalpy. Its atomic number is 10 and its electronic configuration is 1s2 2s2 2p6.

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