75
Re
Rhenium
Transition metal period 6 group 7 d-block discovered: 1925
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 75
- Atomic mass
- 186.207 a.m.u.
- Electron configuration
- [Xe]6s2 4f14 5d5
- Electronegativity
- 1.9 on the Pauling scale
- Atomic radius
- 217 pm
- Ionization energy
- 7.88 eV
- Electron affinity
- 0.15 eV
- Oxidation states
- +7, +6, +4
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 3459 K (3 185,85 °C)
- Boiling point
- 5869 K (5 595,85 °C)
- Density
- 20.8 g/cm³