einsteinium
PubChem Notes:
Einsteinium Einsteinium. A man-made radioactive actinide with atomic symbol Es, atomic number 99, and atomic weight 252. Its known isotopes range in mass number from 243-246. Its valence can be +2 or +3. Einsteinium was originally discovered in the debris from a thermonuclear explosion in 1952.
Es - definition from Biology-Online.org
[symbol for einsteinium.
MediLexicon einsteinium - Medical Dictionary Definition for Term 'einsteinium'
[1. An artificially prepared transuranium element, atomic no. 99, atomic wt. 252.0; it has many isotopes, all of which are radioactive (252Es has the longest known half-life, 1.29 years).
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