21 - Scandium transition metal
Discovered by Lars Fredrik Nilson in 1878
- Atomic Radius (Å)
Scandium is a chemical element with symbol Sc and atomic number 21. A silvery-white metallic d-block element, it has historically been sometimes classified as a rare earth element, together with yttrium and the lanthanoids. It was discovered in 1879 by spectral analysis of the minerals euxenite and gadolinite from Scandinavia.
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 9 | 2 in 3s + 6 in 3p + 1 in 3d |
| 4 | 2 | 2 in 4s |
44.96 u
Atomic Mass
2.1 Å
Atomic Radius
3109 K
Boiling Point
1.7 Å
Covalent Radius
2.98 g/cm³
Density
18
Electron Affinity
1.36
Electronegativity
6.56 eV
First Ionization Energy
1812.15 K
Melting Point
4
Number of Shells
21
Atomic Number
2, 8, 9, 2
Electron Shell Occupations
