Which among the following is not a lanthanide element?

Answer: An element in the modern periodic table with an atomic number other than 57 to 71 is not a lanthanide element.

Lanthanide elements are also called lanthanoids. There are total fifteen elements in the lanthanide series. They are Lanthanum (La), Cerium (Ce), Praseodymium (Pr), Neodymium (Nd), Promethium (Pm), Samarium (Sm), Europium (Eu), Gadolinium (Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Erbium (Er), Thulium (Tm), Ytterbium (Yb), Lutetium (Lu).

The chemical symbol of Lanthanide is Ln. It is used in the manufacturing of various products like a cigarette lighter, tv screens, etc.

Summary:

Which among the following is not a lanthanide element?

Any element that does not fall in between the atomic numbers 57 and 71 in the modern periodic table is not a lanthanide element. Lanthanide or lanthanoid series comprises fifteen elements.