Pulley,+Jalann

103 Lr Lawrencium 262



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Lawrencium was [|made] by [|Albert Ghiorso], Torbjørn Sikkeland, Almon Larsh, and Robert M. Latimer on February 14, 1961 at the Lawrence Radiation Laboratory (now called [|Lawrence Berkeley National Laboratory] ) on the [|University of California, Berkeley] campus. It was produced by bombarding a three [|milligram] target composed of three isotopes of [|californium] with [|boron] -10 and B-11 ions in the Heavy Ion Linear Accelerator (HILAC). ======

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Th e origin of the name, preferred by the [|American Chemical Society], is in reference to [|Ernest O. Lawrence] , inventor of the [|cyclotron]. The symbol **Lw** originally was used but in [|1963] it was changed to **Lr**. In August [|1997] the [|International Union of Pure and Applied Chemistry] (IUPAC) ratified the name lawrencium and symbol **Lr** during a meeting in [|Geneva].  ======

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 The appearance of this element is unknown, however it is most likely silvery-white or gray and [|metallic]. If sufficient amounts of lawrencium were produced, it would pose a [|radiation] hazard. Contrary to some sources, bulk properties of this element, such as the melting point, have not been possible to measure to date. Lawreencium do not have a common use anymore. ======

 Ø atomic number- 103 Ø atomic mass- 262 Ø solid, liquid, gas- Solid Ø metal, non metal, metalloid- Metal Ø  ** period Number:** 7 Ø  ** Group Number:** 3 Ø <span style="font-size: 7pt; mso-fareast-font-family: Wingdings; msofareastfontfamily: Wingdings; msospacerun: yes;"> ** Group Name:** Actinide

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