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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).
Lanthanides and actinides are also called inner transition elements. They are placed at the bottom of the periodic table. Each row has its own name. The elements cerium (Ce) through lutetium (Lu) are called the lanthanides and thorium (Th) through lawrencium (Lr) make up the actinides.Except for uranium few of the inner transition elements are well known.The lanthanides begin with lanthanum (La). The 4f energy levels are very close in energy to the 5d levels.he elements cerium (Ce) through lutetium (Lu) are called the lanthanides and thorium (Th) through lawrencium (Lr) make up the actinides. Except for uranium few of the inner transition elements are well known. The lanthanides begin with lanthanum (La). The 4f energy levels are very close in energy to the 5d levels.