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Scandium is a chemical element with the symbol Sc and atomic number 21. It is a silvery-white metallic d-block element. Historically, it has been classified as a rare-earth element, [9] together with yttrium and the lanthanides. It was discovered in 1879 by spectral analysis of the minerals euxenite and gadolinite from Scandinavia. [10]
Element 21 is a golf and fishing equipment manufacturing company based in Toronto, Ontario, Canada. The company made headlines in 2006 when they paid the Russian Federal Space Agency to send a golf ball into space.
Naturally occurring scandium (21 Sc) is composed of one stable isotope, 45 Sc. Twenty-seven radioisotopes have been characterized, with the most stable being 46 Sc with a half-life of 83.8 days, 47 Sc with a half-life of 3.35 days, and 48 Sc with a half-life of 43.7 hours and 44 Sc with a half-life of 3.97 hours.
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Scandium-44 (44 Sc) is a radioactive isotope of scandium that decays by positron emission to stable 44 Ca with a half-life of 4.042 hours.. 44 Sc can be obtained as a daughter radionuclide of long-lived 44 Ti (t 1/2 60.4 a) from 44 Ti / 44 Sc generator or can be produced by nuclear reaction 44 Ca ( p, n) 44 Sc in small cyclotrons.
The station ultimately upgraded its news production to high definition in 2014. In September 2012, the station canceled their 6:30 p.m. newscast due to low ratings, but the following week launched an 11 p.m. newscast, airing Monday through Friday. In October 2014, WHNS added a weekday hour-long 4 p.m. newscast, called The Four O'Clock News. [27]
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SC21 or SC-21 may refer to: SC21 (United States), a United States Navy program of the 1990s for new ship designs; USS SC-21, a United States Navy submarine chaser commissioned in 1917 and sold in 1921; South Carolina Highway 21; Scandium, chemical element, symbol Sc and atomic number 21