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21
Sc
44.956
Scandium
Transition metals · Group 3 · Period 4
Atomic properties
| Atomic number | 21 |
|---|---|
| Symbol | Sc |
| Standard atomic weight | 44.956 |
| Classification | Transition metals |
| Group | 3 |
| Period | 4 |
| Block | d-block |
| Electron configuration | [Ar] 3d1 4s2 |
| Electronegativity (Pauling) | 1.36 |
| Common oxidation states | +3 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 2.985 g/cm³ |
| Melting point | 1541 °C |
| Boiling point | 2836 °C |
| Discovered | 1879 |
| CAS number | — |