The first element made by humans rather than found — and the lightest with no stable isotope at all.
- Atomic number
- 43
- Atomic mass
- [98] u
- Phase
- Solid
- Electron configuration
- [Kr] 4d⁵ 5s²
- Melting point
- 2,430 K · 2,156.9 °C
- Boiling point
- 4,538 K · 4,264.9 °C
- Density
- 11 g/cm³
- Electronegativity
- 1.9
- Period / Group
- 5 / 7
- Discovery year
- 1937