Einsteinium
>
> Scientists at the University of California, the Argonne National
> Laboratory, and the Los Alamos Scientific Laboratory named this
> element, einsteinium, in honor of the famous scientist, Albert
> Einstein.
>
> Einsteinium is one of the man-made radioactive elements. Its chemical
> symbol is Es, its atomic number is 99, and the most stable isotope of
> einsteinium has a mass number of 254.
>
> Einsteinium was first discovered in 1952 in the debris from a hydrogen
> bomb explosion. Scientists collected this debris on filter papers
> carried by radio-controlled airplanes and from fallout on a nearby
> coral atoll. This new element formed when neutron s from the explosion
> hit atoms of uranium-238, and were captured by its nucleus.
>
> Scientists first made einsteinium in a laboratory in 1954, but only
> small quantities of the element have been produced. Einsteinium is
> unstable, and immediately begins turning into lighter elements by
> radioactive decay. Its different isotopes have a hal f-life of from 7
> minutes to 280 days.
>
> [Image]