Lanthanum

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Lanthanum is a chemical element, having the chemical symbol La.

Lanthanum
138.9055(2)



  La
57
[ ? ] Transition metal:

Its atomic number (the number of protons) is 57. It has a Standard Atomic Weight of 138.9055(2), and is typically found as a solid in its elemental form.

Lanthanum is considered to be a member of the "Transition metal" class of elements, has a boiling point of 3,464 °C , and a melting point of 918 °C .

A white, soft element, Lanthanum also belongs to the rare earth metals, and is namesake of the lanthanides, a group of elements in the Periodic Table.