65 Tb 158.925
Terbium
lanthanide
Properties
- Atomic number
- 65
- Atomic mass
- 158.925 u
- Category
- lanthanide
- Group
- f-block
- Period
- 6
- Block
- f-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- 1.1 (Pauling)
- Density
- 8.23 g/cm³
- Melting point
- 1355.85 °C
- Boiling point
- 3122.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁹
Noble-gas shorthand: [Xe] 4f⁹ 6s²
Electrons per shell: 2, 8, 18, 27, 8, 2 — that's 2 in the outermost shell.
About Terbium
Terbium is a chemical element with symbol Tb and atomic number 65. It is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife. Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime and euxenite.
- Discovered by Carl Gustaf Mosander
- Appearance: silvery white
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.