Einsteinium Facts – Element 99 or Es

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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 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

Element Name: 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)