| 单词 |
mendelevium |
| 释义 |
mendelevium Chem.|mɛndəˈliːvɪəm, -ˈeɪvɪəm|
[f. the name of Dmitri Ivanovich Mendeleev (1834–1907), Russian chemist + -ium.]
An artificially produced transuranic element, the longest-lived isotope of which has a half-life of two months. Atomic number 101; symbol Md (formerly Mv).
1955A. Ghiorso et al. in Physical Rev. XCVIII. 1519/2 We would like to suggest the name mendelevium, symbol Mv, for the new element in recognition of the pioneering role of the great Russian chemist, Dmitri Mendeleev. 1967New Scientist 21 Sept. 598/2 The new mendelevium isotope, with 101 protons and 157 neutrons, falls into the odd-odd class... The long half-life will enable quite large quantities of mendelevium to be made. 1971C. Keller Chem. Transuranium Elements ii. ix. 596 Six isotopes of mendelevium are known with mass numbers 252 and 254–258... They can be produced by the bombardment either of uranium or plutonium with heavy ions, or of einsteinium with α particles. Ibid. 597 Since 258Md can only be obtained by nuclear reactions with accelerated ions, it is impossible to produce weighable quantities. Consequently, the chemical investigation of mendelevium is restricted to tracer work. |
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