Mendelevium: the essentials
Mendelevium is a radioactive rare earth metal named after Dmitri Mendeleev, father of the Periodic Table.
Mendelevium: historical information
Mendelevium, the ninth transuranium element of the actinide series to be discovered, was first identified by Seaborg and others in 1955 as a product of the bombardment of the einsteinium isotope 253Es with helium ions. The isotope produced was 256Md, which has a half-life of about 11/4 hours.
Mendelevium around us Read more »
Mendelevium has no biological role.
Mendelevium is a synthetic element that is not present in the geosphere.
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Physical properties Read more »
- Density of solid: (no data) kg m-3
- Molar volume: (no data) cm3
- Thermal conductivity: 10 (estimate) W m‑1 K‑1
Heat properties Read more »
- Melting point: about 1100 [827 °C (1521 °F)] K
- Boiling point: (no data) K
- Enthalpy of fusion: (no data) kJ mol-1
Crystal structure Read more »
The solid state structure of mendelevium is: .
Mendelevium: orbital properties Read more »
Mendelevium atoms have 101 electrons and the shell structure is 188.8.131.52.31.8.2. The ground state electronic configuration of neutral Mendelevium is [Rn].5f13.7s2 and the term symbol of Mendelevium is 2F7/2.
- Pauling electronegativity: 1.3 (Pauling units)
- First ionisation energy: 635 kJ mol‑1
- Second ionisation energy: (no data) kJ mol‑1
Isolation: coming soon!
Mendelevium isotopes Read more »