The lanthanide series are also called the "rare earth metals" even though this term does not apply today; most of these elements are common in Earth's crust. There are 15 elements that make up the lanthanide series, and they are lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. The lanthanide series is named for the first metal in the series, lanthanum.
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