-- card: 40120 from stack: in
-- bmap block id: 0
-- flags: 0000
-- background id: 14320
-- name: Es


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Es

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Einsteinium

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99

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(252)

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(after Albert Einstein) Identified by Ghiorso at Berkeley in 1952 in debris from the 
first "hydrogen" bomb explosion in the Pacific Ocean in November 1952. Es-254 has the longest half-life of 276 days.


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rare earth metal, radioactive, 11 isotopes

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Electron Configuration:

1s  2s  2p  3s  3p  3d  4s  4p  4d  4f  5s  5p  5d  5f  6s  6p  6d  6f  7s 
 2   2    6    2    6   10   2   6  10  14  2    6  10  11   2   6               2