Which elements are classified as lanthanides?

The classification of lanthanides includes elements with atomic numbers ranging from 57 to 71. This specific group comprises the fifteen metallic elements from lanthanum (La, atomic number 57) to lutetium (Lu, atomic number 71). They are part of the f-block elements in the periodic table and are characterized by the filling of the 4f orbitals.

The significance of these elements lies in their similar properties, which include high melting points, the ability to form stable trivalent cations, and the presence of magnetic and luminescent properties. The lanthanides are commonly used in various applications, such as in the production of strong permanent magnets, phosphors for color television tubes, and catalysts in petroleum refining.

Understanding the correct range of atomic numbers for lanthanides is crucial for exploring their properties and applications, which differentiates them from other groups of elements in the periodic table.