Symbol: Es
Atomic Number: 99
Atomic Weight: 252.083
Element Classification: Radioactive Rare Earth Element (Actinide Series)
Discovered By: Argonne, Los Alamos, U of Calif.
Discovery Date: 1952 (United States)
Name Origin: Named in honor of the scientist Albert Einstein.

Density (g/cc): n/a
Melting Point (K): n/a
Boiling Point (K): 1130
Appearance: Radioactive, synthetic metal
Atomic Radius (pm): 292
Atomic Volume (cc/mol): n/a
Covalent Radius (pm): n/a
Ionic Radius: n/a
Specific Heat (@20C J/g mol): n/a
Fusion Heat (kJ/mol): n/a
Evaporation Heat (kJ/mol): n/a
Thermal Conductivity (@25C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 1.3
First Ionizing Energy (kJ/mol): (620)
Oxidation States: 3
Electronic Configuration: [Rn] 5f11 7s2
Lattice Structure: n/a
Lattice Constant (): n/a
Lattice C/A Ratio: n/a

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