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Name Einsteinium
Symbol Es
Atomic number 99
Atomic mass 252 amu
Normal state Solid
Classification Metallic
Crystal structure Cubic face centered
Color unknown, but probably metallic and silvery white or gray in appearance
Date of discovery 1952
Name of discoverer G.R. Choppin, S.G. Thompson, A. Ghiorso and G.G. Harvey
Name origin Named after the scientist, Albert Einstein.
Uses None.
Obtained from Made by bombarding uranium with neutrons. World production is probably less than 1 gram per year.

Einsteinium (Es) is synthetic, transuranic element with an atomic number of 99. Einsteinium was first noticed in the radioactive fallout from the Ivy Mike nuclear test. It was named after the noted physicist Albert Einstein.