Part Time Accounting Assistant. Accounting Now has an exciting opportunity with a Manufacturing firm in the Northwest suburbs. Our client is looking to add a Part Time Accounting Assistant to their team and ready to start someone quickly! The chosen candidate will demonstrate entry leve.
Lanthanum is considered a rare earth metal because the process to mine it is difficult, time-consuming and expensive. Lanthanum is rarely the dominant lanthanide found in the rare earth minerals, and in their chemical formulae it is usually preceded by cerium. Rare examples of La-dominant minerals are monazite-(La) and lanthanite-(La).
History and Uses: Lanthanum was discovered by Carl Gustaf Mosander, a Swedish chemist, in 1839. Mosander was searching for impurities he believed existed within samples of cerium. He treated cerium nitrate (Ce(NO 3) 3) with dilute nitric acid (HNO 3) and found a new substance he named lanthana (La 2 O 3).Roughly 0.0018% of the earth's crust is composed of lanthanum.anthanum also makes up about 25% of Misch metal, a material that is used to make flints for lighters. Lanthana (La 2 O 3) is used to make the glass used in camera lenses and in other special glasses.