The first Δ i H 1 and second Δ i H 2 ionization enthalpies (in kJ mo l - 1 ) and the electron gain enthalpy Δ eg H (in kJ mo l - 1 ) of the elements I, II, III, IV and V are given below Element Δ i H

Question

The first Δ i H 1 and second Δ i H 2 ionization enthalpies (in kJ mo l - 1 ) and the electron gain enthalpy Δ eg H (in kJ mo l - 1 ) of the elements I, II, III, IV and V are given below Element Δ i H 1 Δ i H 2 Δ eg H I 520 7300 − 60 II 419 3051 −48 III 1681 3374 −328 IV 1008 1846 −295 V 2372 5251 +48 the least reactive non- metal and the most reactive metal of these are respectively

TestHub · Accepted Answer

Generally metals having low I.E.are more reactive and Δ eg H = + ve for noble gas.

Chemistry - PERIODIC TABLE Question with Solution | TestHub

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Doubts & Discussion

Element	$Δ_{i} H_{1}$	$Δ_{i} H_{2}$	$Δ_{eg} H$
I	520	7300	− 60
II	419	3051	−48
III	1681	3374	−328
IV	1008	1846	−295
V	2372	5251	+48