Quick answerTerbium (Tb) is a lanthanide with atomic number 65 and an atomic mass of 158.93 (2023), in period 6. It was discovered by Carl Gustaf Mosander in 1843. It is used for green phosphors and fluorescent lamps. Its electron configuration is [Xe] 4f9 6s2.
Terbium is the green phosphor in screens and lamps, and its alloys move the sonar and actuators of submarines.
Key facts
| Symbol | Tb |
|---|---|
| Atomic number | 65 |
| Atomic mass | 158.93 (IUPAC standard atomic weight, 2023) |
| Category | lanthanide |
| Group | — (f-block element, no group number) |
| Period | 6 |
| Block | f-block |
| Electron configuration | [Xe] 4f9 6s2 |
| Discovered | Carl Gustaf Mosander, 1843 |
| Uses | green phosphors, fluorescent lamps, magnetostrictive alloys, sonar systems, solid-state devices |
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Keep exploring
- Periodic table — all 118 elements
- Neodymium (Nd) — another lanthanide, atomic number 60
- Promethium (Pm) — another lanthanide, atomic number 61
- Samarium (Sm) — another lanthanide, atomic number 62
- Europium (Eu) — another lanthanide, atomic number 63
- Gadolinium (Gd) — another lanthanide, atomic number 64
- Dysprosium (Dy) — another lanthanide, atomic number 66
- Holmium (Ho) — another lanthanide, atomic number 67
- Erbium (Er) — another lanthanide, atomic number 68
- Thulium (Tm) — another lanthanide, atomic number 69
- Ytterbium (Yb) — another lanthanide, atomic number 70
- All lanthanide elements — on the periodic table
Sources & last updated
- CIAAW — Standard Atomic Weights
- PubChem Periodic Table
- Wikipedia — Timeline of chemical element discoveries
Last updated: . Figures are shown with their year; where sources disagree, the value is left out rather than estimated.