Sc
Scandium
Scandium is a chemical element with the symbol Sc and atomic number 21. It has a standard atomic weight of 44.956, sits in period 4 and group 3, and is classified as a transition metal.
Properties
| Symbol | Sc |
|---|---|
| Atomic number | 21 |
| Standard atomic weight | 44.956 |
| Category | Transition metal |
| Group | 3 |
| Period | 4 |
| Electron configuration | [Ar] 3d1 4s2 |
| Outer-shell electrons | 2 |
The figure of 44.956 is a standard atomic weight.
Calculate with scandium
- Molar mass of any formula containing it
- Electron configuration, including ions
- Effective nuclear charge by Slater's rules
- Average atomic mass from isotope abundances
Group 3
Atomic weights are the IUPAC 2021 standard values, abridged to the conventional five significant figures. Group, period, category and electron configuration are derived from the atomic number rather than stored, so they cannot drift out of step with it.