{"id":21473,"date":"2020-02-14T11:31:00","date_gmt":"2020-02-14T10:31:00","guid":{"rendered":"https:\/\/rinconeducativo.org\/efemerides\/14-de-febrero-de-1961-se-descubre-el-lawrencio\/"},"modified":"2024-07-03T11:45:54","modified_gmt":"2024-07-03T09:45:54","slug":"february-14-1961-lawrencium-is-discovered","status":"publish","type":"re_efemeride","link":"https:\/\/rinconeducativo.org\/en\/anniversaries\/february-14-1961-lawrencium-is-discovered\/","title":{"rendered":"February 14, 1961 - Lawrencium is discovered"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/rinconeducativo.org\/wp-content\/uploads\/2022\/11\/Lawrencium.png\" alt=\"\" class=\"wp-image-21477\" width=\"376\" height=\"376\" srcset=\"https:\/\/rinconeducativo.org\/wp-content\/uploads\/2022\/11\/Lawrencium.png 500w, https:\/\/rinconeducativo.org\/wp-content\/uploads\/2022\/11\/Lawrencium-150x150.png 150w, https:\/\/rinconeducativo.org\/wp-content\/uploads\/2022\/11\/Lawrencium-120x120.png 120w\" sizes=\"auto, (max-width: 376px) 100vw, 376px\" \/><\/figure>\n<\/div>\n\n\n<p>Lawrentium or laurentium is a radioactive synthetic element of the periodic table of elements whose symbol is Lr (formerly Lw) and its atomic number is 103. In the periodic table, it is located in the d block and in period 7, and is the last and heaviest element in the actinide series. Chemical experiments confirmed that lawrencium behaves homologously to lutetium and is chemically similar to other actinides.<\/p>\n\n\n\n<p>Lawrencium was first synthesized on February 14, 1961, by the nuclear physics team at the Lawrence Berkeley National Laboratory of the University of California, led by <a href=\"https:\/\/rinconeducativo.org\/en\/recursos-educativos\/albert-ghiorso-co-discoverer-twelve-elements-periodic-table\/\" target=\"_blank\" rel=\"noreferrer noopener\">Albert Ghiorso<\/a>. The first lawrencium atoms were produced by bombarding a three-milligram target, composed of three isotopes of californium with nuclei of boron-10 and boron-11, from a heavy-ion linear accelerator. The team suggested the element name lawrencium, after American physicist Ernest O. Lawrence (inventor of the cyclortron), and the symbol \"Lw\", but the IUPAC changed the symbol to \"Lr\" in 1963.<\/p>\n\n\n\n<p>All isotopes of lawrencium are radioactive; its most stable known isotope is 266Lr, with a half-life of approximately 11 hours, and the other isotopes, except 260Lr,261Lr, and 262Lr, decay with lives of less than one minute.<\/p>\n\n\n\n<p><a href=\"https:\/\/rinconeducativo.org\/en\/recursos-educativos\/lamina-interactiva-sobre-la-tabla-periodica\/\">Access our periodic table interactive sheet<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>February 14, 1961 - Lawrencium is discovered<\/p>\n","protected":false},"author":1088,"featured_media":21477,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tags":[7715,6071],"mes":[7212],"clasificacion_anterior":[],"class_list":["post-21473","re_efemeride","type-re_efemeride","status-publish","has-post-thumbnail","hentry","tag-periodic-table-en","tag-tabla-periodica","mes-february"],"acf":{"fecha":"19610214"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - 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