The number of valence electrons present in the metal among Cr, Co, Fe and Ni which has the lowest enthalpy of atomisation is

Question

Canvas Classes · Accepted Answer

Step 1: Recall enthalpies of atomisation of first-row transition metals

Among Cr, Co, Fe and Ni:

| Metal |  (kJ/mol approx.) |
|---|---|
| Cr | 397 |
| Fe | 418 |
| Co | 427 |
| Ni | 430 |

Chromium (Cr) has the lowest enthalpy of atomisation among these four.

Step 2: Find valence electrons of Cr

Electronic configuration of Cr:

Valence electrons =

Answer: (c) 6

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