Fajan's rules: covalent character (Smaller/higher-charge cation polarizes larger anion → more covalent character)
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Smaller/higher-charge cation polarizes larger anion → more covalent character
What each symbol means
| Symbol | What it stands for |
|---|---|
| z/r | Polarizing power of cation (qualitative) |
| anion size | Larger anion more polarizable |
When to use this
Qualitative trends for melting point, solubility, colour in some cases.