The transition metal having highest ionisation enthalpy is:

Question

The transition metal having highest  ionisation enthalpy is:

Canvas Classes · Accepted Answer

Concept: 3rd Ionisation Enthalpy (IE₃)

IE₃ = energy to remove 3rd electron from M²⁺ ion.

M²⁺ configurations (4s electrons removed first):

| Element | M²⁺ Config | Electron removed | Reason for high IE₃ |
|---------|------------|------------------|---------------------|
| Cr |  |  | Gains half-filled |
| Mn |  |  | Loses half-filled |
| V |  |  | Normal |
| Fe |  |  | Gains half-filled |

Mn²⁺ has the half-filled  configuration — removing the 3rd electron disrupts this extra-stable arrangement

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