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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

Manganese (Z=25)

Text Solution

Verified by Experts

The correct Answer is:
D
In `._(23)V=1s^(2), 2s^(2)2p^(6),3s^(2)3p^(6)3d^(3),4s^(2)`
Third electron which is removed to give third ionisation potential, belongs to `3d^(3)` subshell.
`._(24)Cr=1s^(2),2s^(2),2p^(6),3s^(2)3p^(6),4s^(1)`
Third electron which is removed to give third ionisation potential, belongs to `3d^(6)` subshell.
`._(25)Mn= 1s^(2), 2s^(2)2p^(6), 3s^(2)3p^(6)3d^(5),4s^(2)`
Third electron which is removed to give third ionisation potential, belongs to `3d^(5)` subshell.
In all elements shell and subshells are same. Required amount of energy (enthalpy) is based upon the stability of d-subshell of d-subshell.
The `3d^(5)` -subshell has highest stability in all because it is half-filled subshell. So, Mn shows highest third ionsation potential.
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