The lanthanide or lanthanoid series comprises the fourteen elements with atomic numbers 58 through 71, from cerium to lutetium. All lanthanides are f-block elements, corresponding to the filling of the 4f electron shell. Lanthanum, which is a d-block element, may also be considered to be a lanthanide.
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lanthanide Any of the 15 chemical elements from lanthanum (atomic number 57) to lutetium (atomic number 71) with very similar chemistry.
