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mendelevium n. 一種放射性元素 一種放射性元素 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) [synonym: {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.
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