Tantalum: Difference between revisions
Jump to navigation
Jump to search
imported>Milton Beychok m (Replaced infobox,added content to infobox, edited the first part of the lede.) |
imported>Meg Taylor No edit summary |
||
| (2 intermediate revisions by one other user not shown) | |||
| Line 1: | Line 1: | ||
{{subpages}} | {{subpages}} | ||
{{Elem_Infobox | {{Elem_Infobox | ||
|elName=Tantalum | |elName=Tantalum | ||
| Line 8: | Line 7: | ||
|no3= | |no3= | ||
|no4= | |no4= | ||
|properties=Heavy, gray, ductile and | |properties=Heavy, gray, ductile and very hard metal. | ||
|compounds= | |compounds= | ||
|uses= | |uses= | ||
|hazard | |hazard | ||
}} | }} | ||
'''Tantalum''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Ta. Its [[atomic number]] (the number of [[proton]]s) is 73. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 180.9479 g•mol<sup> −1</sup> and is a [[solid]] in its elemental form. | '''Tantalum''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Ta. Its [[atomic number]] (the number of [[proton]]s) is 73. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 180.9479 g•mol<sup> −1</sup> and is a [[solid]] in its elemental form. | ||
Tantalum is considered a member of the "Transition metal" class of elements. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of 5,458 °[[Celsius (unit)|C]] and a [[melting point]] of 3,017 °C. | Tantalum is considered a member of the "Transition metal" class of elements. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of 5,458 °[[Celsius (unit)|C]] and a [[melting point]] of 3,017 °C. | ||
Tantalum was discovered in 1802 and is used in manufacturing [[Capacitance|electrolytic capacitors]] for the [[electronics]] industry. The tantalum capacitors are a common choice for use in cellular phones and other mobile electronics, because of the fact that they have the highest capacitance-to-volume ratio, and are therefore the smallest in size, relative to any other capacitor technology. | Tantalum was discovered in 1802 and is used in manufacturing [[Capacitance|electrolytic capacitors]] for the [[electronics]] industry. The tantalum capacitors are a common choice for use in cellular phones and other mobile electronics, because of the fact that they have the highest capacitance-to-volume ratio, and are therefore the smallest in size, relative to any other capacitor technology. | ||
Tantalum is mined in the form known as [[coltan]], an ore of [[columbite]] and [[tantalite]]. It has been estimated that a high percentage of the world's coltan reserves are located in the [[Democratic Republic of Congo]] (DRC).<ref>http:// | Tantalum is mined in the form known as [[coltan]], an ore of [[columbite]] and [[tantalite]]. It has been estimated that a high percentage of the world's coltan reserves are located in the [[Democratic Republic of Congo]] (DRC).<ref name=BBC>[http://news.bbc.co.uk/2/hi/africa/1468772.stm Congo's coltan rush] Helen Vesperini, August 1, 2001, BBC News website</ref><ref name=UMich>[http://sitemaker.umich.edu/section002group3/coltan_mining_in_democratic_republic_of_the_congo Coltan Mining in the Democratic Republic of Congo] University of Michigan website</ref><ref>[http://www.thirdworldtraveler.com/Africa/Business_War_Congo.html The Business of War in the Democratic Republic of Congo] Dena Montague and Frida Berrigan, Dollars and Sense magazine, July/ August 2001</ref> There has been continued strife in the DRC for many years related to coltan mining and corruption.<ref name=BBC/><ref name=UMich/> | ||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
Latest revision as of 03:27, 16 December 2013
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Tantalum is a chemical element, having the chemical symbol Ta. Its atomic number (the number of protons) is 73. It has a standard atomic weight of 180.9479 g•mol −1 and is a solid in its elemental form.
Tantalum is considered a member of the "Transition metal" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 5,458 °C and a melting point of 3,017 °C.
Tantalum was discovered in 1802 and is used in manufacturing electrolytic capacitors for the electronics industry. The tantalum capacitors are a common choice for use in cellular phones and other mobile electronics, because of the fact that they have the highest capacitance-to-volume ratio, and are therefore the smallest in size, relative to any other capacitor technology.
Tantalum is mined in the form known as coltan, an ore of columbite and tantalite. It has been estimated that a high percentage of the world's coltan reserves are located in the Democratic Republic of Congo (DRC).[1][2][3] There has been continued strife in the DRC for many years related to coltan mining and corruption.[1][2]
References
- ↑ 1.0 1.1 Congo's coltan rush Helen Vesperini, August 1, 2001, BBC News website
- ↑ 2.0 2.1 Coltan Mining in the Democratic Republic of Congo University of Michigan website
- ↑ The Business of War in the Democratic Republic of Congo Dena Montague and Frida Berrigan, Dollars and Sense magazine, July/ August 2001