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 actually three times more abundant in the earth's crust than lead! Rare earth metals are very hard to isolate, though. Lanthanum has an atomic number of 57, which means it has 57 protons in its nucleus. It's also the 57th element on the periodic table. The chemical symbol for lanthanum is La.