43
Tc
Technetium
Transition metal period 5 group 7 d-block discovered: 1937
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 43
- Atomic mass
- 96.90636 a.m.u.
- Electron configuration
- [Kr]5s2 4d5
- Electronegativity
- 1.9 on the Pauling scale
- Atomic radius
- 209 pm
- Ionization energy
- 7.28 eV
- Electron affinity
- 0.55 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
- 2430 K (2 156,85 °C)
- Boiling point
- 4538 K (4 264,85 °C)
- Density
- 11 g/cm³