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لانتانیدها

Also known as rare earths, lanthanide series, lanthanoid, lanthanoid series element, lanthanoid series elements

A lanthanide () is any of the 15 metallic chemical elements with atomic numbers 57–71, from lanthanum through lutetium. In the periodic table, the first fourteen (up to ytterbium) fill the 4f orbitals. Lutetium (element 71) is also often considered a lanthanide, despite being a d-block element and a transition metal. The IUPAC lists the 15 elements La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, under the collective name lanthanoid (), which it recommends as chemically more correct for this series.

AI overview

Lanthanides are 15 metallic elements found on the periodic table (atomic numbers 57–71) that share similar chemical properties because of how their electrons are arranged. These elements are important in modern technology and materials, though they are often grouped together because their chemistry makes them behave in comparable ways.

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