Mendelevium • Actinide Rare Earth
Symbol: Md
Date of discovery: 1955
Name origin: Dmitri Mendeleev
Appearance: unknown
Discoverer: Albert Ghiorso
Obtained from: man-made
Melting point: 1100 K
Boiling point: unknown
Density[kg/m3]: unknown
Molar volume: unknown
Protons/Electrons: 101
Neutrons: 157
Shell structure: 2,8,18,32,31,8,2
Electron configuration: [Rn]5f137s2
Oxidation state: 2,3
Crystal structure: unknown
Named after Dmitri Mendeleev, father of the periodic table, mendelevium is a metallic, radioactive transuranic element of the actinides. It is a synthetic element first identified by Albert Ghiorso in the Berkeley Radiation Laboratory’s 60-inch cyclotron. The isotope produced was 256Md, which has a half-life of 76 minutes. This first identification was notable in that 256Md was synthesized on a one-atom-at-a-time basis. As only very little mendelevium has ever been made, mendelevium has no uses.
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