69 Tm 168.934
Thulium
lanthanide
Properties
- Atomic number
- 69
- Atomic mass
- 168.934 u
- Category
- lanthanide
- Group
- f-block
- Period
- 6
- Block
- f-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- 1.25 (Pauling)
- Density
- 9.32 g/cm³
- Melting point
- 1544.85 °C
- Boiling point
- 1949.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹³
Noble-gas shorthand: [Xe] 4f¹³ 6s²
Electrons per shell: 2, 8, 18, 31, 8, 2, which is 2 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Thulium
Thulium is a chemical element with symbol Tm and atomic number 69. It is the thirteenth and antepenultimate (third-last) element in the lanthanide series. Like the other lanthanides, the most common oxidation state is +3, seen in its oxide, halides and other compounds.
- Discovered by Per Teodor Cleve
- Appearance: silvery gray
Thulium: frequently asked questions
- What is Thulium?
- Thulium (Tm) is the chemical element with atomic number 69. It is a metal: specifically a lanthanide.
- What is the atomic number of Thulium?
- Thulium's atomic number is 69, which means every Thulium atom has 69 protons in its nucleus.
- What is the electron configuration of Thulium?
- The electron configuration of Thulium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f13 (noble-gas shorthand: [Xe] 4f13 6s2). Its electrons are arranged in shells of 2, 8, 18, 31, 8, 2, with 2 in the outermost shell.
- Is Thulium a metal or a nonmetal?
- Thulium is a metal: specifically a lanthanide.
- What group and period is Thulium in?
- Thulium sits in the f-block (the lanthanide row) of period 6 on the periodic table.
- Is Thulium a solid, liquid, or gas?
- At room temperature, Thulium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.