Lanthanum is a chemical element with the symbol La and the atomic number 57. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in …

2023年6月23日 · Lanthanum is a chemical element with the atomic number 57 and is represented by the symbol ‘La’ in the periodic table. It is soft and silvery in appearance and classified as rare earth metal and belongs to the d-block of the lanthanide group of the periodic table.

lanthanum (La), chemical element, a rare-earth metal of Group 3 of the periodic table, that is the prototype of the lanthanide series of elements. Lanthanum is a ductile and malleable silvery white metal that is soft enough to be cut with a knife.

Lanthanum is one of the rare earth elements used to make carbon arc lights which are used in the motion picture industry for studio lighting and projector lights. Lanthanum also makes up about 25% of Misch metal, a material that is used to make flints for lighters.

2019年8月2日 · Lanthanum is element number 57 with element symbol La. It is a soft, silver-colored, ductile metal known as the starting element for the lanthanide series. It is a rare earth element that usually displays the oxidation number of +3.

2025年1月18日 · Lanthanum is a soft, silvery-white metallic element with the symbol La and atomic number 57. It is the first element in the lanthanide series and is a rare earth element. Lanthanum has significant applications in modern technology, ranging from catalysis to advanced optical materials.

2013年6月20日 · Lanthanum is silvery white, malleable, ductile and so soft you can slice it with a knife. It is one of the most reactive rare-earth metals, which are also called lanthanides. The element reacts...