Periodic Properties - Trends
| Property | Across a Period (←→) | Down a Group (↑↓) |
|---|---|---|
| No. of shells | Same | Increase |
| Atomic radii | Decrease | Increase |
| Metallic character | Decrease | Increase |
| Non‑metallic character | Increase | Decrease |
| Ionisation potential | Increase | Decrease |
| Electron affinity | Increase | Decrease |
| Electronegativity | Increase | Decrease |
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