Difference between revisions of "Selenium"
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{{Element | name=Selenium | symbol=Se | anumber=34| amass=79.0 amu | noe=34| class=Non-metal | cstructure=Hexagonal | color=Gray | date=1817 | discname=[[Jöns Berzelius]] | origname=From the Greek word ''Selênê'' (Moon) | uses=Photoelectric cells, TV cameras | obtained=Refining of lead, copper, nickel}} | {{Element | name=Selenium | symbol=Se | anumber=34| amass=79.0 amu | noe=34| class=Non-metal | cstructure=Hexagonal | color=Gray | date=1817 | discname=[[Jöns Berzelius]] | origname=From the Greek word ''Selênê'' (Moon) | uses=Photoelectric cells, TV cameras | obtained=Refining of lead, copper, nickel}} | ||
| − | {{ | + | {{Periodic table}} |
'''Selenium''' ''(si-LEE-nee-em)'' is a conductive non-metal. It is primarily useful in electronic devices, especially in light-sensitive devices. | '''Selenium''' ''(si-LEE-nee-em)'' is a conductive non-metal. It is primarily useful in electronic devices, especially in light-sensitive devices. | ||
==History== | ==History== | ||
| − | Selenium was discovered by a Swedish chemist named Jöns Jacob Berzelius, in 1817. | + | Selenium was discovered by a Swedish chemist named Jöns Jacob Berzelius, in 1817.<ref>http://education.jlab.org/itselemental/ele034.html</ref> |
==Additional Properties== | ==Additional Properties== | ||
| − | Melting Point: 428. | + | Melting Point: 428.9 °F (220.5 °C or 493.65 K) |
| − | Boiling Point: | + | Boiling Point: 1265 °F (685 °C or 958 K) |
Density: 4.809 grams per cubic centimeter | Density: 4.809 grams per cubic centimeter | ||
State of Matter at Room Temperature: Solid<ref>http://education.jlab.org/itselemental/ele034.html</ref> | State of Matter at Room Temperature: Solid<ref>http://education.jlab.org/itselemental/ele034.html</ref> | ||
| − | |||
| − | |||
Color: gray<ref>http://www.chemicalelements.com/elements/se.html</ref> | Color: gray<ref>http://www.chemicalelements.com/elements/se.html</ref> | ||
| − | + | ||
==Uses== | ==Uses== | ||
| − | Selenium's electrical resistance is greatly affected by the amount of light shining on it. Bright light causes it to conduct better, while darkness reduces conductivity. This special property has made selenium useful in devices that respond to the intensity of light, such as electric eyes, photo cells, light meters for cameras and copiers. It is also is able to generate energy in direct sunlight. For this reason, it is a vital ingredient of solar cells. <ref>http://education.jlab.org/itselemental/ele034.html</ref> | + | Selenium's electrical resistance is greatly affected by the amount of light shining on it. Bright light causes it to conduct better, while darkness reduces conductivity. This special property has made selenium useful in devices that respond to the intensity of light, such as electric eyes, photo cells, light meters for cameras and copiers. It is also is able to generate energy in direct sunlight. For this reason, it is a vital ingredient of solar cells.<ref>http://education.jlab.org/itselemental/ele034.html</ref> |
Selenium is also useful in converting [[alternating current]] to [[direct current]], which is why it is used in [[rectifier]]s. | Selenium is also useful in converting [[alternating current]] to [[direct current]], which is why it is used in [[rectifier]]s. | ||
| Line 27: | Line 25: | ||
<references /> | <references /> | ||
| − | ==External | + | ==External links== |
| − | https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional | + | *https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional |
| − | + | *http://www.chemicalelements.com/elements/se.html | |
| − | http://www.chemicalelements.com/elements/se.html | ||
Latest revision as of 01:26, September 9, 2016
| Selenium | |
|---|---|
| Properties | |
| Atomic symbol | Se |
| Atomic number | 34 |
| Classification | Non-metal |
| Atomic mass | 79.0 amu |
| Other Information | |
| Date of discovery | 1817 |
| Name of discoverer | Jöns Berzelius |
| Name origin | From the Greek word Selênê (Moon) |
| Uses | Photoelectric cells, TV cameras |
| Obtained from | Refining of lead, copper, nickel |
History
Selenium was discovered by a Swedish chemist named Jöns Jacob Berzelius, in 1817.[1]
Additional Properties
Melting Point: 428.9 °F (220.5 °C or 493.65 K)
Boiling Point: 1265 °F (685 °C or 958 K)
Density: 4.809 grams per cubic centimeter
State of Matter at Room Temperature: Solid[2]
Color: gray[3]
Uses
Selenium's electrical resistance is greatly affected by the amount of light shining on it. Bright light causes it to conduct better, while darkness reduces conductivity. This special property has made selenium useful in devices that respond to the intensity of light, such as electric eyes, photo cells, light meters for cameras and copiers. It is also is able to generate energy in direct sunlight. For this reason, it is a vital ingredient of solar cells.[4] Selenium is also useful in converting alternating current to direct current, which is why it is used in rectifiers.