81
Tl
Thallium
Post-transition metal period 6 group 13 p-block discovered: 1861
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 81
- Atomic mass
- 204.383 a.m.u.
- Electron configuration
- [Xe]6s2 4f14 5d10 6p1
- Electronegativity
- 1.62 on the Pauling scale
- Atomic radius
- 196 pm
- Ionization energy
- 6.108 eV
- Electron affinity
- 0.2 eV
- Oxidation states
- +3, +1
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 577 K (303,85 °C)
- Boiling point
- 1746 K (1 472,85 °C)
- Density
- 11.8 g/cm³