A synthetic radioactive transuranic element of the actinide series that has known isotopes with mass numbers ranging from 245 to 262. The isotopes with the longest half-lives are Md-258 (51.5 days) and Md-260 (31.8 days). Atomic number 101; melting point 827°C; valence 2,3.
A radioactive, metallic chemical element, one of the actinides, produced by bombarding einsteinium with high-energy alpha particles in a cyclotron: symbol, Md; at. no. 101
A synthetic, radioactive metallic element of the actinide series that is produced by bombarding einsteinium with helium ions. Its most stable isotope is Md 258 with a half-life of approximately 51.5 days. Atomic number 101.
Origin of mendelevium
- After Dmitri Ivanovich Mendeleev
From American Heritage Dictionary of the English Language, 5th Edition