Lanthanide
A lanthanide () is any of the 14 metallic chemical elements with atomic numbers 57–70, from lanthanum through ytterbium. The IUPAC recommended standard name of this series is lanthanoid ().
From Wikipedia
A lanthanide () is any of the 14 metallic chemical elements with atomic numbers 57–70, from lanthanum through ytterbium. The IUPAC recommended standard name of this series is lanthanoid ().