The transition metal having highest 3rd ionisation enthalpy is:

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Q.
The transition metal having highest 3rd ionisation enthalpy is: [2024]

1 Mn

2 Fe

3 Cr

4 V

Ans.
(1)

Metal Sc Ti V Cr Mn Fe Co Ni Cu Zn

Third
ionization
energy
( ${kJmol}^{- 1}$ ) 2393 2657 2833 2990 3260 2962 3243 3402 3556 3829

Ionization energy increases from left to right across a period. But third ionization energy of Mn is more than that of Fe because third electron from Mn is to be removed from stable $d^{5}$ configuration.

Metal Electronic
configuration of M Electronic
configuration of $M^{2 +}$

Mn ${}_{18}{[Ar]} 3 d^{5} 4 s^{2}$ ${}_{18}{[Ar]} 3 d^{5}$

Fe ${}_{18}{[Ar]} 3 d^{6} 4 s^{2}$ ${}_{18}{[Ar]} 3 d^{6}$

Cr ${}_{18}{[Ar]} 3 d^{5} 4 s^{1}$ ${}_{18}{[Ar]} 3 d^{4}$

V ${}_{18}{[Ar]} 3 d^{3} 4 s^{2}$ ${}_{18}{[Ar]} 3 d^{3}$

Hence among given options Mn has highest third ionization energy.

Solution

Q.
The transition metal having highest 3rd ionisation enthalpy is: [2024]

1 Mn

2 Fe

3 Cr

4 V

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Metal	Sc	Ti	V	Cr	Mn	Fe	Co	Ni	Cu	Zn
Third ionization energy ( ${kJmol}^{- 1}$ )	2393	2657	2833	2990	3260	2962	3243	3402	3556	3829

Metal	Electronic configuration of M	Electronic configuration of $M^{2 +}$
Mn	${}_{18}{[Ar]} 3 d^{5} 4 s^{2}$	${}_{18}{[Ar]} 3 d^{5}$
Fe	${}_{18}{[Ar]} 3 d^{6} 4 s^{2}$	${}_{18}{[Ar]} 3 d^{6}$
Cr	${}_{18}{[Ar]} 3 d^{5} 4 s^{1}$	${}_{18}{[Ar]} 3 d^{4}$
V	${}_{18}{[Ar]} 3 d^{3} 4 s^{2}$	${}_{18}{[Ar]} 3 d^{3}$

Solution

Q. The transition metal having highest 3rd ionisation enthalpy is: [2024]

1 Mn

2 Fe

3 Cr

4 V

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Q.
The transition metal having highest 3rd ionisation enthalpy is: [2024]