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Einsteinium is a synthetic chemical element; it has symbol Es and atomic number 99. It is named after Albert Einstein and is a member of the actinide series and the seventh transuranium element . Einsteinium was discovered as a component of the debris of the first hydrogen bomb explosion in 1952.
Einsteinium (99 Es) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes.The first isotope to be discovered (in nuclear fallout from the Ivy Mike H-bomb test) was 253 Es in 1952.
A minor actinide is an actinide, other than uranium or plutonium, found in spent nuclear fuel.The minor actinides include neptunium (element 93), americium (element 95), curium (element 96), berkelium (element 97), californium (element 98), einsteinium (element 99), and fermium (element 100). [2]
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99 Einsteinium: List: 227 Es 228 Es 229 Es 230 Es 231 Es 232 Es 233 Es 234 Es ... Wikipedia: WikiProject Elements/Isotope tables/Element 91-100.
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In 1999, evidence for two superheavy elements (element 116 and element 118) was published by a group in Berkeley. The discovery group intended to propose the name ghiorsium for element 118, but eventually the data were found to have been tampered and in 2002 the claims were withdrawn.