The Element Einsteinium


Einsteinium was first identified in December 1952 by Albert Ghiorso at the University of California, Berkeley. Similar to fermium, einsteinium too was found while examining debris from the first hydrogen bomb test of November, 1952.

The element does not exist in nature in its elemental form therefore it is synthetically made. The process of creating the element starts with the irradiation of plutonium-239 in a nuclear reactor for several years. The only indication of its properties can be derived from its position in the period table to show that it is similar to other metals although its industrial uses are yet to be uncovered.

Atomic Number & Chemical Properties


Element Basics:

Chemical 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
Date of Discovery: 1952 (United States)
Origin of Name: Named in honor of the scientist Albert Einstein.

How to Recognize it at a Party:

Radioactive, synthetic metal

Seriously Atomic Information:

Density (g/cc): n/a
Melting Point (°K): n/a
Boiling Point (°K): 1130
Atomic Radius (pm): 292
Atomic Volume (cc/mol): n/a
Covalent Radius (pm): n/a
Ionic Radius: n/a
Pauling Negativity Number: 1.3
First Ionizing Energy (kJ/mol): (620)
Oxidation States: 3
Electronic Configuration: [Rn] 5f11 7s2

Getting Intimate with Einsteinium:

Lattice Structure: n/a
Lattice Constant (Å): n/a
Lattice C/A Ratio: n/a
Specific Heat (@20°C J/g mol): n/a
Fusion Heat (kJ/mol): n/a
Evaporation Heat (kJ/mol): n/a
Thermal Conductivity (@25°C W/m K):
Debye Temperature (°K): n/a


Society's Questions About Einsteinium:

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The following list shows the most common online questions about the element Einsteinium. Are your questions the same or different from everyone else's?

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