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Lanthanum


57

La

Lanthanum
138.90550
2
8
18
18
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3

Source

Lanthanum is a chemical element with symbol La and atomic number 57. It is a soft, ductile, silvery-white metallic chemical element. It tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. It gave its name to the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table:it is also sometimes considered the first element of the 6th-period transition metals.