Mendelevium

101
Md
257

Properties

Symbol Name Atomic Number Atomic Weight Group Number
Md Mendelevium 101 257

Description

Standard State: presumably a solid at 298 K
Color: unknown, but probably metallic and silvery white or Gray in appearance

Mendelevium is the ninth transuranium element of the actinide series to be discovered.   Ghiorso, Harvey, Choppin, Thompson, and Seaborg first identified it early in 1955. Experiments seem to show that the elements possesses a moderately stable dipositive (II) oxidation state in addition to the tripositive (III) oxidation state, which is characteristic of actinide elements.