Q.

Which of the following metal is expected to have the highest third ionization enthalpy?

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a

Cr (Z = 24)

b

V (Z=23)

c

Mn (Z = 25)

d

Fe(Z=26)

answer is C.

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Detailed Solution

Mn⁡(Z=25)(Ar)3d54s2↓IP1Mn+(Ar)3d54s1 IP2↓Mn2+(Ar)3d5 (half-filled 3d subshell)  ↓IP3
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Which of the following metal is expected to have the highest third ionization enthalpy?