Es occurs as synthetic element in the periodic table that has the symbol Es & atomic number 99. The metallic highly radioactive transuranic element (7th in the series) in the actinides, einsteinium is by bombarding plutonium with neutrons and was found in the junk of the number one hydrogen bomb test. It was known as fallowing Albert Einstein and has no known utilizes. Tracer studies using the isotope Es-253 show that es has chemical properties typical of the heavily trivalent, actinoid element. Es has 99 protons, 99 negatron & 153 neutrons.

History
Es was first identified in December 1952 by Albert Ghiorso at the University of California, Berkeley and another team headed by G.R. Choppin at Los Alamos National Laboratory. Two were examining dust from either a number 1 hydrogen bomb test of November, 1952 (see Operation Ivy). It found a isotope einsteinium-253 (half-life 20.5 years) that was manufactured per nuclear fusion of 15 neutrons with uranium-238 (which then went across heptad beta decays). These findings were saved secret until 1955 due to Cold War tensions, however.

Around 1961, enough es was synthesized to develop the macroscopical total of Es-253. This sample weighed astir Nought.01 mg & was measured utilizing the favorite balance. The material produced was wont to make mendelevium. Farther es has been produced at a Oak Ridge National Laboratory's High Flux Isotope Reactor in Tennessee by bombarding plutonium-239 with neutrons. About Triad mg was created above the quadruplet month program of irradiation and so chemical separation from either the starting I kilo of atomic number 94 isotope.

Isotopes
Xx radioisotopes of einsteinium use been characterized, by using the virtually all stalls existence Es-252 by having a half-life of 471.7 years, Es-254 using the half-life of 275.Vii years, Es-255 by having the half-life of 39.Eighter from decatur years, & Es-253 by having the half-life of Twenty.47 years. Tons of the left over radioactive isotopes use half-lifes that come less than Xl hours, & a majority one have half lifes that come less than Half-hour. This element besides has Tercet meta states, with a virtually all horse barn existence Es-254m (t_½ 39.Trey hours). A isotopes of atomic number 99 home in atomic weight from 241.0686620 amu (Es-241) to 257.0959790 amu (Es-257).