lawrencium

lawrencium
/law ren"see euhm/, n. Chem.
a synthetic, radioactive, metallic element. Symbol: Lr; at. no.: 103.
[1960-65; Lawrence Radiation Laboratory, Berkeley, California + -IUM]

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 (Lr), synthetic chemical element, the 14th member of the actinoid series of the periodic table, atomic number 103. Not occurring in nature, lawrencium (as the isotopes lawrencium-257, lawrencium-258, and lawrencium-259) was produced (1961) by Albert Ghiorso, T. Sikkeland, A.E. Larsh, and R.M. Latimer at the University of California, Berkeley, by bombarding a mixture of the longest-lived isotopes of californium (atomic number 98) with boron ions (atomic number 5) accelerated in a heavy-ion linear accelerator. A team of Soviet scientists at the Joint Institute for Nuclear Research in Dubna discovered (1965) lawrencium-256 (35-second half-life), which the Berkeley group used to show that lawrencium behaves more like the tripositive elements in the actinide series than like predominantly dipositive nobelium (atomic number 102).

atomic number
103
stablest isotope
256
oxidation state
+3
electronic config.
[Rn]5f146d17s2

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Universalium. 2010.

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  • Lawrencium — (pronEng|ləˈrɛnsiəm) is a radioactive synthetic element with the symbol Lr (formerly Lw) and atomic number 103.Its most stable known isotope is 262Lr, with a half life of approximately 3.6 hours. Little is known of the chemistry but there is… …   Wikipedia

  • Lawrencium — Nobélium ← Lawrencium → Rutherfordium Lu …   Wikipédia en Français

  • lawrencium — [ lɔrɑ̃sjɔm ] n. m. • 1962; de Lawrence, n. d un physicien amér. ♦ Chim. Élément atomique (Lr; no at. 103), le dernier de la série des actinides. Isotope du lawrencium obtenu par bombardement du californium. ● lawrencium nom masculin (de E. O.… …   Encyclopédie Universelle

  • lawrencium — Symbol: Lr Atomic number: 103 Atomic weight: (262) Appearance unknown, however it is most likely silvery white or grey and metallic. Lawrencium is a synthetic rare earth metal. There are eight known radioisotopes, the most stable being Lr 262… …   Elements of periodic system

  • lawrencium — n. [from Ernest O. Lawrence, inventer of the cyclotron.] A transuranic element of atomic number 103. It was discovered in 1961 by bombardment of californium in a cyclotron with boron nuclei. Other isotopes were prepared in 1965 at Dubna. The… …   The Collaborative International Dictionary of English

  • Lawrencium — 1961, Modern Latin, from the name of Ernest O. Lawrence (1901 1958), U.S. physicist, cyclotron pioneer and founder of the lab where it was discovered …   Etymology dictionary

  • lawrencium — ☆ lawrencium [lô ren′sē əm ] n. [ModL: so named after E. O. Lawrence (see LAWRENCE2 Ernest O(rlando)), who invented the cyclotron + IUM] a radioactive, metallic chemical element, the last member of the actinide series: originally produced by… …   English World dictionary

  • Lawrencium — Eigenschaften …   Deutsch Wikipedia

  • Lawrencium — lourensis statusas T sritis fizika atitikmenys: angl. lawrencium vok. Lawrencium, n; Lawrentium, n rus. лоуренсий, m pranc. lawrencium, m …   Fizikos terminų žodynas

  • lawrencium — lourensis statusas T sritis fizika atitikmenys: angl. lawrencium vok. Lawrencium, n; Lawrentium, n rus. лоуренсий, m pranc. lawrencium, m …   Fizikos terminų žodynas

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