A transition metal 'M' among Sc, Ti, V, Cr, Mn and Fe has the highest second ionisation enthalpy. The spin-only magnetic moment value of ion is BM (Near integer).

(Given atomic number Sc: 21, Ti: 2

Question

A transition metal 'M' among Sc, Ti, V, Cr, Mn and Fe has the highest second ionisation enthalpy. The spin-only magnetic moment value of  ion is  BM (Near integer).

(Given atomic number Sc: 21, Ti: 22, V: 23, Cr: 24, Mn: 25, Fe: 26)

Canvas Classes · Accepted Answer

Step 1: Find metal with highest 2nd ionisation enthalpy (IE₂)

IE₂ = energy to remove 2nd electron from M⁺.

M⁺ configurations:

| Element | M⁺ Config | Electron removed for IE₂ | Reason |
|---------|-----------|--------------------------|--------|
| Sc |  →  | from  | Normal |
| Ti |  →  | from  | Normal |
| V |  →  | from  | Normal |
| Cr |  | from  (half-filled!) | Highest IE₂ |
| Mn |  →  | from  | Normal |
| Fe |  →  | from  | Normal |

Cr⁺ has the configuration  (half-filled, extra stable)

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