The transition metal having the highest 3^{rd | vedclass

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(B) The $3^{rd}$ ionisation enthalpy $(IE_3)$ corresponds to the removal of an electron from the $M^{2+}$ ion.Electronic configurations of $M^{2+}$ io

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$Mn$

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(B) The $3^{rd}$ ionisation enthalpy $(IE_3)$ corresponds to the removal of an electron from the $M^{2+}$ ion.Electronic configurations of $M^{2+}$ ions:$V^{2+}: [Ar] 3d^3$$Cr^{2+}: [Ar] 3d^4$$Mn^{2+}: [Ar] 3d^5$$Fe^{2+}: [Ar] 3d^6$$Mn^{2+}$ has a stable half-filled $d$-orbital configuration $(3d^5)$. Removing an electron from this stable configuration requires a significantly higher amount of energy compared to the others.Experimental values $(kJ/mol)$:$V: 2833$$Cr: 2990$$Mn: 3260$$Fe: 2962$Thus,$Mn$ has the highest $3^{rd}$ ionisation enthalpy among the given elements.

The transition metal having the highest $3^{rd}$ ionisation enthalpy is:

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