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).
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.