Lanthanum: Difference between revisions
imported>David Yamakuchi mNo edit summary |
imported>Milton Beychok (minor edit) |
||
| (4 intermediate revisions by 3 users not shown) | |||
| Line 1: | Line 1: | ||
{{subpages | {{subpages}} | ||
A white, soft element, | {{Elem_Infobox | ||
|elName=Lanthanum | |||
|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>10</sup>5s<sup>2</sup>5p<sup>6</sup>5d<sup>1</sup>6s<sup>2</sup> | |||
|no1= | |||
|no2= | |||
|no3= | |||
|no4= | |||
|properties=Soft, silvery-white,malleable, ductile metal. | |||
|compounds= | |||
|uses= | |||
|hazard= | |||
}} | |||
'''Lanthanum''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] La. Its [[atomic number]] (the number of [[proton]]s) is 57. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 138.9055 g•mol<sup> −1</sup> and is a [[solid]] in its elemental form. | |||
Lanthanum is considered to be 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 3,464 °[[Celsius (unit)|C]] and a [[melting point]] of 920 °C. | |||
A white, soft element, lanthanum is classified in a number of different "categories" of elements. In addition to being a transition metal, it belongs to the "rare earth metals", (which include [[scandium]], [[yttrium]], and [[actinium]]), and is also the namesake of the "lanthanides", a group of elements in the periodic table having atomic numbers from 57 (lanthinide itself) to 71 ([[lutetium]]). | |||
Latest revision as of 19:01, 27 April 2011
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Lanthanum is a chemical element, having the chemical symbol La. Its atomic number (the number of protons) is 57. It has a standard atomic weight of 138.9055 g•mol −1 and is a solid in its elemental form.
Lanthanum is considered to be a member of the "Transition metal" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 3,464 °C and a melting point of 920 °C.
A white, soft element, lanthanum is classified in a number of different "categories" of elements. In addition to being a transition metal, it belongs to the "rare earth metals", (which include scandium, yttrium, and actinium), and is also the namesake of the "lanthanides", a group of elements in the periodic table having atomic numbers from 57 (lanthinide itself) to 71 (lutetium).