lantanideja
Lanthanideja is a term that refers to the lanthanide elements, which are a series of 15 metallic elements with atomic numbers 57 through 71. These elements are part of the lanthanide series, which is a subset of the rare earth elements. The lanthanide series is named after lanthanum, the first element in the series. The lanthanide elements are characterized by their similar chemical properties and the presence of a partially filled 4f electron shell. They are typically silvery-white in appearance and are relatively soft and malleable.
The lanthanide elements are often found together in nature and are typically extracted from rare earth minerals
The lanthanide elements are also of interest to scientists due to their unique magnetic and optical properties.