Scandium (Sc)
Scandium is the chemical element with atomic number 21 and symbol Sc. It is a transition metal in period 4, group 3, with a standard atomic weight of 44.956 u.
Key facts
- Z
- 21
- Atomic weight
- 44.956 u
- Category
- transition metal
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1879
- CAS
- 7440-20-2
Measured properties
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.36 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,814 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 3,109 K | National Center for Biotechnology Information (NIH) |
| Density stp | 2.99 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 211 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 633 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 18.1 kJ/mol | National Center for Biotechnology Information (NIH) |
Electron configuration
- Noble gas notation
- [Ar] 3d¹ 4s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹ 4s²
- Electrons per shell
- 2, 8, 9, 2