65 · Tb
Terbium
Separated by Mosander in 1843.
Identity
- Atomic number
- 65
- Symbol
- Tb
- Canonical name
- Terbium
- Category
- lanthanide
- Group
- unassigned
- Period
- 6
- Block
- f
Series set apart from the main table. Whether group 3 is lanthanum or lutetium (actinium or lawrencium) is still discussed, so the group is left empty.
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
- 158.925352 u
- Electron configuration
- [Xe] 4f9 6s2
- Electrons per shell
- 2, 8, 18, 27, 8, 2
- Standard state
- solid
- Density
- 8.23 g/cm³
- Melting point
- 1,629 K
- Boiling point
- 3,396 K
- Electronegativity
- 1.1 Pauling
- First ionization energy
- 565.8 kJ/mol
- Electron affinity
- 112.4 kJ/mol
Notable isotopes
This summary is not an inventory of every isotope.
- Tb-159 · 100 % · stable
History
Terbium in yttria
Discovery · confirmed · 1843
Mosander separates terbium from the yttria of Ytterby. The names of the Ytterby earths were later reassigned.
Etymology
- Theme
- place
- Language
- suédois
- Root
- Ytterby
- Meaning
- Ytterby, via the earth terbia
Scientists
Places and institutions
- Stockholm — 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