101
Md
Mendelevium
Actinide period 7 f-block discovered: 1955
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 101
- Atomic mass
- 258.09843 a.m.u.
- Electron configuration
- [Rn]7s2 5f13
- Electronegativity
- 1.3 on the Pauling scale
- Ionization energy
- 6.58 eV
- Oxidation states
- +3, +2
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 1100 K (826,85 °C)