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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. There are 18 known radioisotopes from 240 Es to 257 Es, and 4 nuclear isomers.
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name ghiorsium for element 118, but eventually the data were found to have been tampered and in 2002 the claims were withdrawn. Ghiorso's lifetime output comprised about 170 technical ...
Rock and dust samples retrieved by NASA from the asteroid Bennu exhibit some of the chemical building blocks of life, according to research that provides some of the best evidence to date that ...
It is an actinide and the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities, although pure fermium metal has not been prepared yet. [5] A total of 20 isotopes are known, with 257 Fm being the longest-lived with a half-life of 100.5 days.
Scientists Probed a Medieval Alchemist’s Artifacts—and Found an Element That Changes History. Tim Newcomb. August 1, 2024 at 10:30 AM.
10 Charming Valentine's Day Traditions Throughout History. Tierney McAfee. ... It's a charming way to add an element of surprise to Valentine's Day gifting! Boston Globe - Getty Images.
The target material, einsteinium-253, could be produced readily from irradiating plutonium: one year of irradiation would give a billion atoms, and its three-week half-life meant that the element 101 experiments could be conducted in one week after the produced einsteinium was separated and purified to make the target.