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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

(3) the most reactive non-metal.

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The element III which has high first ionization enthalpy (\triangle_{i}H_{1}) and a very high negative electron gain enthalpy (\triangle_{eg}H) is the most reactive non-metal.

Posted by

Divya Prakash Singh

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