Which of the following is the correct order of the first ionization enthalpies?

Question

Canvas Classes · Accepted Answer

First ionisation enthalpies of 3d transition metals:

General trend: increases across the period, but with irregularities at half-filled () and fully filled () configurations.

| Element | Z | Config | IE₁ (kJ/mol) |
|---------|---|--------|---------------|
| Ti | 22 |  | 658 |
| Mn | 25 |  | 717 (extra stability of ) |
| Cr | 24 |  | 653 |
| Cu | 29 |  | 745 (extra stability of ) |

Increasing order:

Actually: Ti (658) < Cr (653)? No — Cr = 653 < Ti = 658.

Correct values: Cr (653) < Ti (658)

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