| einstein | A unit of energy equal to 1 mol quantum, hence to 6.0221367 × 1023 quanta. The value of einstein, in kJ, is dependent upon the wavelength. Origin: A. Einstein, German-born theoretical physicist and Nobel laureate in U.S., 1879-1955 (05 Mar 2000) |
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| einsteinium | <chemical> 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. Chemical name: Einsteinium (12 Dec 1998) |