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The first \( \left(\Delta \mathrm{H}_{1}\right) \) and second \( \left(\Delta \mathrm{H}_{2}\right) \) ionisation
\( \mathrm{P} \) enthalpies (in \( \mathrm{KJ} \mathrm{mol}^{-1} \) ) and the electron gain

W enthalpy \( \left(\Delta_{\mathrm{eg}} \mathrm{H}\right. \) ) (in \( \mathrm{KJ} \mathrm{mol}{ }^{-1} \) ) of the elements I, II, III. IV, \( V \) and VI are given below:
\( \begin{array}{llllll}\text { Elements } & \boldsymbol{\Delta} \mathbf{H}_{\mathbf{1}} & & \Delta \mathbf{H}_{\mathbf{2}} & & \boldsymbol{\Delta}_{\mathrm{eg}} \mathbf{H} \\ \text { I } & 520 & 7300 & - & 60 \\ \text { II. } & 419 & 3051 & - & 48 \\ \text { III. } & 1681 & 3374 & - & 328 \\ \text { IV. } & 1008 & 1846 & - & 295 \\ \text { V. } & 2372 & 5251 & + & 48 \\ \text { VI. } & 738 & 1451 & - & 40\end{array} \)
The least reactive element based on the above data is:
(1) III
(2) IV
(3) II
(4) \( \mathrm{V} \)
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