21 · Sc
Scandium
Identified by Nilson in 1879. The space had been predicted by Mendeleev, who did not discover it.
Identity
- Atomic number
- 21
- Symbol
- Sc
- Canonical name
- Scandium
- Category
- transition metal
- Group
- 3
- Period
- 4
- Block
- d
- Former names
- eka-bore
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- 44.955909 u
- Electron configuration
- [Ar] 3d1 4s2
- Electrons per shell
- 2, 8, 9, 2
- Standard state
- solid
- Density
- 2.985 g/cm³
- Melting point
- 1,814 K
- Boiling point
- 3,109 K
- Electronegativity
- 1.36 Pauling
- First ionization energy
- 633.1 kJ/mol
- Electron affinity
- 18 kJ/mol
Notable isotopes
This summary is not an inventory of every isotope.
- Sc-45 · 100 % · stable
History
Scandium in euxenite
Discovery · confirmed · 1879
Nilson identifies scandium. Mendeleev had predicted a space; he did not isolate the element.
Etymology
- Theme
- place
- Language
- latin
- Root
- Scandia
- Meaning
- Scandinavia
Scientists
Places and institutions
- Uppsala — historical setting : Sweden — present country : Sweden
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements