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mendelevium

n. 一种放射性元素

一种放射性元素

WordNet (r) 3.0 (2006) (WordNet)

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}]

The Collaborative International Dictionary of English v.0.48 (gcide)

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]

The Elements Database (element)

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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