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The first \( \left(\Delta_{\mathrm{i}} \mathrm{H}_{1}\right) \) and the second \( \left(\Delta_{\mathrm{i}} \mathrm{H}_{2}\right) \) ionization enthalpies (in kJmol \( \left.{ }^{-1}\right) \) and the \( \left(\Delta_{\mathrm{eg}} \mathrm{H}\right. \) : electron gain enthalpy (in \( \mathrm{kJ} \mathrm{mol}^{-1} \) ) of a few elements are given below :
\( \begin{array}{llll}\text { Elements } & \Delta_{\mathrm{i}} \mathrm{H}_{1} & \Delta_{\mathrm{i}} \mathrm{H}_{2} & \Delta_{\mathrm{eg}} \mathrm{H} \\ \text { I } & 520 & 7300 & -60 \\ \text { II } & 419 & 3051 & -48 \\ \text { III } & 1681 & 3374 & -328 \\ \text { IV } & 1008 & 1846 & -295 \\ \text { V } & 2372 & 5251 & +48 \\ \text { VI } & 738 & 1451 & -40\end{array} \)
The least reactive element -
(1) Element I
(2) Element II
(3) Element IV
(4) Element V
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