65
Tb
158.93
Terbium (Tb)
Element 65 · Period 6 · Lanthanide series
lanthanide
solid at room temp
f-block
About Terbium
Used in solid-state devices, trichromatic lighting, and magnetostrictive alloys.
Physical Properties
Atomic Mass
158.93 u
State at 25°C
Solid
Melting Point
1356 °C
Boiling Point
3230 °C
Density
8.23 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Xe] 4f⁹ 6s²
Electron Shells
2, 8, 18, 27, 8, 2
Atomic Radius
221 pm
Ionization Energy
566 kJ/mol
Oxidation States
+3
Discovery & History
Discovered By
Carl Gustaf Mosander
Discovery Year
1843
Named By
Carl Gustaf Mosander
Name origin: Ytterby, Sweden
Frequently Asked Questions
- Is Terbium a metal, nonmetal, or metalloid?
- Terbium is classified as a lanthanide.
- What state is Terbium in at room temperature?
- Terbium is a solid at standard room temperature (25°C).
- What is the atomic mass of Terbium?
- Terbium has an atomic mass of 158.93 atomic mass units (u).
- Who discovered Terbium?
- Terbium was discovered by Carl Gustaf Mosander in 1843.
- Where is Terbium on the periodic table?
- Terbium is element number 65, located in period 6, part of the lanthanide series shown below the main table.