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The first (Delta iH1) and the second (Delta iH2) ionization enthalpies (in kJ mol–1) and the ( Delta egH) electron gain enthalpy (in kJ molraised to minus 1) of a few elements are given below:

3.31 The first \Delta _ i H_1 and the second \Delta _ i H_2  ionization enthalpies (in KJ mol ^{-1} )  \Delta _{eg }H electron gain enthalpy (in KJ mol ^{-1}) of a few elements are given below:
Elements           \Delta H_1 \: \: \: \: \: \: \Delta H_2 \: \: \: \: \: \: \: \Delta _{eg }H
I                         520             7300         –60
II                        419             3051         –48
III                     1681             3374         –328
IV                     1008            1846         –295
V                      2372            5251           +48
VI                     738              1451            –40

(a)  the least reactive element.

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The element which has highest first ionization enthalpy (\triangle_{i}H_{1}) and positive electron gain enthalpy (\triangle_{eg}H) is element\ V.

And also element V shows similar behaviour like inert gases because of positive electron gain enthalpy.

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