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1st \( \left(\Delta \mathrm{H}_{1}\right) \) and \( 2 \mathrm{nd}\left(\Delta \mathrm{H}_{2}\right) \) lonization Enthalpies
(in \( \mathrm{kJ} \mathrm{mol}^{-1} \) ) 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{tabular}{|l|l|l|l|}
\hline Elements & \( \Delta \mathrm{H}_{1} \) & \( \Delta \mathrm{H}_{2} \) & \( \Delta_{\mathrm{eg}} \mathrm{H} \) \\
\hline I & 520 & 7300 & \( -60 \) \\
\hline II & 419 & 3051 & \( -48 \) \\
\hline III & 1681 & 3374 & \( -328 \) \\
\hline IV & 1008 & 1846 & \( -295 \) \\
\hline V & 2372 & 5251 & \( +48 \) \\
\hline VI & 738 & 1451 & \( -40 \) \\
\hline
\end{tabular}
The most reactive metal is -
1. VI
2. III
3. I
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