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 is usually found in combination with cerium and other rare earth elements, and it was first found by the Swedish chemist Carl Gustav Mosander in 1839 as an impurity in cerium nitrate â hence the name lanthanum, from the Greek Î»Î±Î½Î¸Î±Î½ÎµÎ¹Î½ (lanthanein), meaning to lie hidden.lthough it is classified as a rare earth element, lanthanum is the 28th most abundant element in the Earth's crust, being just under three times as abundant as lead. In minerals such as monazite and bastnaesite, bastnÃ¤site lanthanum makes up over a quarter of the lanthanide. content