mendelevium

mendelevium
    n 1: a radioactive transuranic element synthesized by bombarding
         einsteinium with alpha particles (Md is the current symbol
         for mendelevium but Mv was formerly the symbol) [syn:
         {mendelevium}, {Md}, {Mv}, {atomic number 101}]
    

mendelevium \men*de*le"vi*um\ (m[e^]n*d[e^]*l[=e]"v[=e]*[u^]/m),
   a. [From Dmitri Mendeleyev, discoverer of the periodic law.]
   (Chem.)
   an unstable radioactive element discovered in 1955 and
   produced artificially only in very small quantities; symbol
   Md (also Mv). It is a transuranic element with atomic number
   101. Isotopes 255, 256, 257, and 258 have been prepared.
   Md258, the longest-lived, has a half-life of two months.
   --HCP61
   [PJC]
    

mendelevium
Symbol: Md
Atomic number: 101
Atomic weight: (256)
Radioactive metallic transuranic element. Belongs to the actinoid
series.
Only known isotope, Md-256 has a half-life of 1.3 hours. First
identified
by Glenn T. Seaborg, Albert Ghiorso and associates in 1955. Alternative
name {unnilunium} has been proposed. Named after the 'inventor' of the
periodic table, Dmitri Mendeleev.