21
Sc
Scandium
Transition metal period 4 group 3 d-block discovered: 1879
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 21
- Atomic mass
- 44.95591 a.m.u.
- Electron configuration
- [Ar]4s2 3d1
- Electronegativity
- 1.36 on the Pauling scale
- Atomic radius
- 211 pm
- Ionization energy
- 6.561 eV
- Electron affinity
- 0.188 eV
- Oxidation states
- +3
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 1814 K (1 540,85 °C)
- Boiling point
- 3109 K (2 835,85 °C)
- Density
- 2.99 g/cm³