Cerium

Cerium, SIHR ee uhm, is a soft, gray metal of the rare-earth group of chemical elements. Cerium... More >>

Erbium

Erbium, UR bee uhm (chemical symbol, Er), is one of the rare earth metals. Its atomic number... More >>

Europium

Europium, yu ROH pee uhm (chemical symbol, Eu), is one of the rare-earth metals. It is soft and... More >>

Gadolinium

Gadolinium, gad uh LIHN ee um, is a silver-white metal of the rare-earth group of chemical... More >>

Holmium

Holmium, HOHL mee uhm (chemical symbol, Ho) is one of the rare-earth metals. Its atomic number... More >>

Lanthanum

Lanthanum, LAN thuh nuhm, is a soft, silvery-white metallic element. It tarnishes rapidly when... More >>

Neodymium

Neodymium, nee uh DIHM ee uhm (chemical symbol, Nd), is a metallic element belonging to the... More >>

Promethium

Promethium, pruh MEE thee uhm (chemical symbol Pm), is a chemical element and one of the... More >>

Samarium

Samarium, suh MAR ee uhm (chemical symbol, Sm), is a chemical element and one of the rare-earth... More >>

Terbium

Terbium, TUR bee uhm (chemical symbol, Tb), is a chemical element and one of the rare-earth... More >>

Thulium

Thulium, THOO lee uhm, is one of the rare-earth elements. It occurs with other rare-earth... More >>

Ytterbium

Ytterbium, ih TUR bee uhm, is a soft silvery metal. Small amounts of ytterbium are used in... More >>