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Lawrencium is a synthetic chemical element; it has symbol Lr (formerly Lw) and atomic number 103. It is named after Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements.
Lawrencium (103 Lr) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized was 258 Lr in 1961. There are fourteen known isotopes from 251 Lr to 266 Lr, except 263 Lr and 265 Lr, and seven isomers.
That machine was used in the discovery of elements 102–106 (102, nobelium; 103, lawrencium; 104, rutherfordium; 105, dubnium and 106, seaborgium), each produced and identified on the basis of only a few atoms. The discovery of each successive element was made possible by the development of innovative techniques in robotic target handling ...
Charles Hatchett named element 41 columbium in 1801 [4] (Cb), [5] but after the publication of On the Identity of Columbium and Tantalum by William Hyde Wollaston in 1809, the claims of discovery of Hatchett were mistakenly considered refuted. [6] In 1846, Heinrich Rose discovered that tantalite contained an element similar to tantalum and ...
Group 3 is the first group of transition metals in the periodic table.This group is closely related to the rare-earth elements.It contains the four elements scandium (Sc), yttrium (Y), lutetium (Lu), and lawrencium (Lr).
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Seven sovereign states – Argentina, Australia, Chile, France, New Zealand, Norway, and the United Kingdom – have made eight territorial claims in Antarctica.These countries have tended to place their Antarctic scientific observation and study facilities within their respective claimed territories; however, a number of such facilities are located outside of the area claimed by their ...