Scandium (Sc)
Scandium (Sc) is element 21 of the periodic table, a transition metal in period 4 and group 3. Its standard atomic weight is 44.955907, so one mole of scandium atoms has a mass of 44.955907 g. At room temperature it is a solid; it melts at 1540.85 °C and boils at 2835.85 °C.
| Atomic number | 21 |
|---|---|
| Symbol | Sc |
| Standard atomic weight | 44.955907 |
| Molar mass | 44.955907 g/mol |
| Category | Transition metal |
| Group | 3 |
| Period | 4 |
| Block | d-block |
| Electron configuration | [Ar] 4s2 3d1 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 1.36 |
| Atomic radius (van der Waals) | 211 pm |
| First ionisation energy | 6.561 eV (633 kJ/mol) |
| Electron affinity | 0.188 eV |
| State at room temperature | Solid |
| Melting point | 1814 K (1540.85 °C) |
| Boiling point | 3109 K (2835.85 °C) |
| Density | 2.99 g/cm³ |
| Discovered | 1879 |
Group 3
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Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.