Lanthanum: Difference between revisions
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'''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 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 | Lanthanum 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 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]]). | 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]]). | ||
Revision as of 18:59, 27 April 2011
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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 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).