单词 | mendelevium |
释义 | mendelevium/ˌmɛndəˈliːvɪəm![]() noun [mass noun] The chemical element of atomic number 101, a radioactive metal of the actinide series. It does not occur naturally and was first made in 1955 by bombarding einsteinium with helium ions. (Symbol: Md) Californium - 249 has a half-life of 350 years; mendelevium - 258, fifty-one days; seaborgium - 266 twenty-one seconds....
Origin1950s: modern Latin, from the name of D. Mendeleev (see Mendeleev, Dmitri). |
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