Atomic Properties
- Atomic Number
- 69
- Atomic Mass
- 168.9300 u
- Electron Configuration
- [Xe] 4f13 6s2
- Electronegativity
- 1.25
- Block
- f-block
- Group
- —
- Period
- 6
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 1818.00 K
- Boiling Point
- 2223.00 K
- Density
- 9.3200 g/cm³
About Thulium
Rarest lanthanide; used in portable X-ray machines and lasers.
Isotopes of Thulium
Thulium has 1 naturally occurring isotope.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 169Tm | 169 | 168.9342179 | 100.00% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)