MeSH definition : 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.; 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.;
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. 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.