101 Md 258
Mendelevium
Actinide
Mendelevium (Md) is a chemical element with atomic number 101, classified as a actinide. At room temperature it is a solid. It was discovered in 1955 by Albert Ghiorso et al..
Properties
- Atomic number
- 101
- Atomic mass
- 258 u
- Category
- Actinide
- Group
- 0
- Period
- 7
- Block
- f-block
- Electron configuration
- [Rn] 5f¹³ 7s²
- Phase at STP
- Solid
- Density
- —
- Melting point
- 1100 K (826.9 °C)
- Boiling point
- —
- Electronegativity
- 1.3
- Atomic radius
- —
- Ionization energy
- 6.58 eV
- Discovery
- 1955 · Albert Ghiorso et al.
Common uses
Research only
Did you know?
Named after Dmitri Mendeleev, creator of the periodic table.
Experiment with the elements
Mendelevium doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.