The Rare Earth Elements are of the Lanthanide and Actinide series. Most of the elements in the Actinide series are synthetic or man-made.

Brief Facts about the Discovery and History of the Element Mendelevium
Mendelevium was first synthesized in the USA by Albert Ghiorso (team leader), Glenn T. Seaborg, Bernard Harvey, and Greg Choppin in 1955. Discovery credited to Glenn T. Seaborg

Occurrence of the element Mendelevium
Man-made

Common Uses of Mendelevium
No known use

The Properties of the Element Mendelevium
Name of Element : Mendelevium
Symbol of Element : Md
Atomic Number: 101
Atomic Mass: (258.0) amu
Melting Point: Unknown
Boiling Point: Unknown
Number of Protons/Electrons: 101
Number of Neutrons: 157
Crystal Structure: Unknown
Density @ 293 K: Unknown
Color: Unknown