Q.

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

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a

V (Z=23)

b

Cr  (Z=24)

c

Mn (Z=25)

d

Fe(Z=26)

answer is C.

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Detailed Solution

Mn: [Ar]3d54s2   has two electrons in 4s, hence loosing third electron will require high energy as electron will be removed from half filled 3d

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