Compare elements
Put two to four elements side by side. The highest and lowest value in each row are marked.
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Put two to four elements side by side. The highest and lowest value in each row are marked.
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HighestLowestin each row
| Category | Alkali metal | Alkali metal |
|---|---|---|
| Position | Group 1 · Period 3 · s-block | Group 1 · Period 4 · s-block |
| State at 25 °C | Solid | Solid |
| Atomic mass | 22.990 uLowest | 39.098 uHighest |
| Electronegativity | 0.93Highest | 0.82Lowest |
| First ionization energy | 495.8 kJ/molHighest | 418.8 kJ/molLowest |
| Electron affinity | 52.9 kJ/molHighest | 48.3 kJ/molLowest |
| Atomic radius | 180 pmLowest | 220 pmHighest |
| Covalent radius | 166 pmLowest | 203 pmHighest |
| Density | 0.970 g/cm³Highest | 0.890 g/cm³Lowest |
| Melting point | 371.0 KHighest | 336.5 KLowest |
| Boiling point | 1,156.0 KHighest | 1,032.0 KLowest |
| Electron configuration | [Ne] 3s1 | [Ar] 4s1 |
| Valency | 1 | 1 |
| Common oxidation states | +1 | +1 |
| Discovered | 1807 | 1807 |
| Atomic model | ||
| Main uses | Not written yet | Not written yet |