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einsteinium
Heslo einsteinium Heslo anglicky Einsteinium Vysvetľujúca pozn. v angl. A man-made radioactive actinide with atomic symbol Es, and atomic number 99. Its known isotopes range in mass number from 240-258. Its valence can be +2 or +3. Einsteinium was originally discovered in the debris from a thermonuclear explosion in 1952. 
predmetové heslo
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