Yttrium: Difference between revisions
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imported>Howard C. Berkowitz mNo edit summary |
imported>Milton Beychok m (Replaced infobox and revised lede somewhat.) |
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{{Elem_Infobox | |||
|elName=Yttrium | |||
|eltrnCfg=1s<sup>2</sup>2s<sup>2</sup>2p<sup>6</sup>3s<sup>2</sup>3p<sup>6</sup>3d<sup>10</sup>4s<sup>2</sup> | |||
4p<sup>6</sup>4d<sup>1</sup>5s<sup>2</sup> | |||
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|properties=Soft, silvery, lustrous metal. Highly crystalline. | |||
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'''Yttrium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Y. Its [[atomic number]] (the number of [[proton]]s) is 39. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 88.9059 g•mol<sup> −1</sup> and is a [[solid]] in its elemental form. | |||
Yttrium is considered to be a member of the "Transition metal" class of element. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of 3,345 °[[Celsius (unit)|C]] and a melting point of 1,522 °C. | |||
It has some applications in nuclear power reactors, especially those whose weight must be minimized.<ref name=RD-Declass>{{citation | It has some applications in nuclear power reactors, especially those whose weight must be minimized.<ref name=RD-Declass>{{citation | ||
| title = Restricted Data Declassification Decisions, 1946 to the Present | | title = Restricted Data Declassification Decisions, 1946 to the Present | ||
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| date = 1 January 2002 | | date = 1 January 2002 | ||
| url = http://www.fas.org/sgp/othergov/doe/rdd-8.pdf}}, pp. 34 and 133 </ref> Yttrium is a component of the semiconductor laser material, [[YAG]] (yttrium aluminum garnet). | | url = http://www.fas.org/sgp/othergov/doe/rdd-8.pdf}}, pp. 34 and 133 </ref> Yttrium is a component of the semiconductor laser material, [[YAG]] (yttrium aluminum garnet). | ||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
Revision as of 16:56, 21 April 2011
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Yttrium is a chemical element, having the chemical symbol Y. Its atomic number (the number of protons) is 39. It has a standard atomic weight of 88.9059 g•mol −1 and is a solid in its elemental form.
Yttrium is considered to be a member of the "Transition metal" class of element. At a pressure of 101.325 kPa, it has a boiling point of 3,345 °C and a melting point of 1,522 °C.
It has some applications in nuclear power reactors, especially those whose weight must be minimized.[1] Yttrium is a component of the semiconductor laser material, YAG (yttrium aluminum garnet).
References
- ↑ Restricted Data Declassification Decisions, 1946 to the Present, U.S. Department of Energy, 1 January 2002, RDD-8, pp. 34 and 133