The first (ΔiH1) and the second (ΔiH) ionization enthalpies (in kJ mol⁻¹) and the (ΔegH) electron gain enthalpy (in kJ mol⁻¹) of a few elements are given below: Elements iH iH egH I 520 7300 –60 II 419 3051 –48 III 1681 3374 –328 IV 1008 1846 –295 V 2372 5251 +48 VI 738 1451 –40 Name the above elements likely to be: (a) the least reactive element. (b) the most reactive metal. (c) the most reactive non-metal. (d) the least reactive non-metal. (e) the metal which can form a stable binary halide of the formula MX2, (X=halogen).

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TextTrends in Ionization Enthalpy Across Periodic TableTrends in Electron Gain Enthalpy Across Periodic TablePeriodic Trends in Chemical Properties of Elements

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