Einsteinium
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.
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Subheadings:
Tree Number(s): D01.268.271.100.250, D01.268.556.244, D01.496.749.305.100.250, D01.552.020.337, D01.552.544.244
MeSH Unique ID: D004540
Registry Number: WV8XL34X3O