einsteiniumn.
/ʌɪnˈʃtʌɪnɪəm//ʌɪnˈstʌɪnɪəm/ Chemistry.
An artifically produced radioactive element. Symbol Es. Atomic number 99. Atomic mass of isotope 253 (1967) 253·0847.
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E1955
einsteinium1955
1955 A. Ghiorso et al. in Physical Rev. 1 Aug. 1049/1 We suggest for the element with the atomic number 99 the name einsteinium (symbol E) after Albert Einstein, and for the element with atomic number 100 the name fermium (symbol Fm), after Enrico Fermi.
1958 Times 29 Aug. 6/3 The following 10 [transuranic elements] were known..einsteinium (99), fermium (100).
1967 New Scientist 6 July 22/2 Oak Ridge National Laboratory says it has succeeded in separating roughly one ten millionth of an ounce of einsteinium, the transuranic element first discovered in 1954.
This entry has not yet been fully updated (first published 1972; most recently modified version published online September 2018).
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