Atomic Radius Trends (Covalent/metallic radii decrease across a period, increase down a group)
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Covalent/metallic radii decrease across a period, increase down a group
What each symbol means
| Symbol | What it stands for |
|---|---|
| r | Atomic radius (covalent or metallic depending on context) |
When to use this
Trends assume comparable definitions. Transition metals show smaller left-to-right changes due to d shielding. Noble gases use van der Waals radii — not comparable to covalent radii in strict ranking questions.