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Einsteinium Facts

Chemical & Physical Properties

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This quartz vial contains approximately 300 micrograms of solid Einsteinium-253.

Einsteinium is a man-made radioactive metal. This quartz vial contains approximately 300 micrograms of solid Einsteinium-253. The blue light results from the intense radiation produced by einsteinium, primarily in the form of alpha decay.

R.G. Haire, US Department of Energy Einsteinium is a radioactive rare earth element.

Einsteinium is a radioactive rare earth element.

R.G. Haire, US Department of Energy This diagram of an einsteinium atom shows the electron shell.

This diagram of an einsteinium atom shows the electron shell.

Greg Robson,Creative Commonns License
Periodic Table of the Elements

Einsteinium

Atomic Number: 99

Symbol: Es

Atomic Weight: (254)

Discovery: Ghiorso et al. 1952

Electron Configuration: 5f11

Group: Rare Earth, Actinides

Melting Point: 1133.2 K

1st Ionization Energy: 619 kJ/mole

Electronegativity: 1.3

Shells: 2,8,18,32,29,8,2

Characteristics: Radioactive

Atomic Radius: 186 pm

Source: Man-made

References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952)

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