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Four successive members of the first row...

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy ?

A

vanadium (Z=23)

B

chromium (Z=24)

C

iron (Z=26)

D

maganese (Z=25)

Text Solution

Verified by Experts

The correct Answer is:
D
(A) V(Z=23): `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(3)`
(B) Cr(Z=24): `1s^(2)2s^(2)2p^(6)3s^(2)4s^(2)3d^(6)`
(C) Fe (Z=26) : `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(6)`
(D) Mn(Z=25) : `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(4)`
third ionisation energy will be highest in case of Mn(Z=25) as the third electron has to be removed from exactly half filled 3d -subshell
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