#99 Einsteinium

Einsteinium is a synthetic element with symbol Es and atomic number 99. A member of the actinide series, it is the seventh transuranic element. Einsteinium was discovered as a component of the debris of the first hydrogen bomb explosion in 1952, and named after Albert Einstein.

Atomic mass:(252.0) amu

Melting point: Unknown

Boiling point: Unknown

Density:293 K: Unknown