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The Element of Selenium

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Hannah Grace

on 16 October 2012

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Transcript of The Element of Selenium

The Element of Selenium
Also credited with originating terms ‘catalysis’, ‘polymer’, ‘isomer’, and ‘allotrope’. Jons Jacob Berzelius August 20, 1779- August 7, 1848 Born in Ostergotland (East Gothland) in Sweden He lost both parents at an early age, but was taken in by relatives Graduated as a M.D. in 1802 from Uppsala University Along with discovering selenium, he discovered silicon, thorium, and cerium The element of Selenium Was founded in 1817. Berzelius was studying chemicals with used in making sulfuric acid in a chemistry plant near Gripsholm. Among the chemicals he thought one material was the element tellurium. Berzelius took the material back to his own laboratory in Stockholm and found that it was not tellurium, similar to it, but a new element. The name 'Selenium' comes from the greek word 'selene' meaning moon. 'Selene' is also the name of a greek goddess Density: 4.79 grams/centimeters cubed Color: Gray, purple grey, red Luster: Sub-Metallic Boiling Point: 958K= 685°C= 1265°F Melting Point: 494K= 221°C= 430°F Hardness:
scale of Brinell: 736 MN m-2
scale of Mohs: 2 Chemical Properties Physical Properties Selenium is not radioactive. It reacts nitric and sulfuric acid. Periodic Table Information of Selenium Period: 4 Electronegativity: 2.55 (Pauling) or
2.48 (Allrod Rochow) Ionization Energy 1st:
941 kJ mol-1 Ionization Energy 2nd:
2044 kJ mol-1 Ionization Energy 3rd:
2974 kJ mol-1 The atomic size is 116pm Orbital Block:
P Electron configuration:
1s2 2s2 2p6 3s2 3p6 3d10 4p6 Or [Ar] 3d10 4p6 Isotopes of Selenium Selenium-74 It is used for the production of Selenium-75 Selenium-76 It is a metal It can be used for the production of medical isotopes Br-75 and Br-76 Selenium-77 It is a metal. Along with Selenium-78, it is used for the production of therapeutic radioisotope Br-77 It is a metal Selenium-78 It is a metal. Along with Selenium-77, it is used for the production of therapeutic radioisotope Br-77 Selenium-80 It is a metal. It is used for the production of the medical radioisotope Br-80m Selenium-82 It is a metal. It has been used to study double beta decay. Where Can Selenium Be Found in Nature? It can be found in the earth's crust However selenium is mainly a by-product other metals such as:
Copper
Iron
Lead Some of the major producers of selenium includes:
Japan, Canada, Belgium, United States, Germany Two of the most important uses of Selenium includes glass making and electronics Selenium is used in glass making by effecting the color. Selenium will neutralize the iron color or it could give the glass a ruby red. It also reduces the amount of sunlight through the glass Selenium is also used by creating different pigments for paints, plastics, ceramics, and glazes. Selenium in foods include the Brazil nuts, fish, meat, and eggs Works Cited:
•http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/electrochemistry/berzelius.aspx
•http://www.chemicalelements.com/elements/se.html
•http://www.chemistryexplained.com/elements/P-T/Selenium.html#b
•http://environmentalchemistry.com/yogi/periodic/Se.html
•http://webmineral.com/data/Selenium.shtml#.UHHnw5hsiSo
•http://education.jlab.org/itselemental/ele034.html
•http://www.gordonengland.co.uk/elements/se.htm
•http://www.knowledgedoor.com/2/elements_handbook/selenium.html
http://www.tracesciences.com/se.htm
http://www.news-medical.net/news/2004/07/02/3048.aspx
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