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1 definition found
 for Es
From The Collaborative International Dictionary of English v.0.48 :

  Es \Es\ n.
     the chemical symbol for einsteinium, a transuranic element
     with atomic number 99. The atomic weight of the longest-lived
     isotope, with a half-life of 276 days, is 254. The first
     isotope discovered, having atomic weight 253 and a half-life
     of 20 days, was recognized in 1952 in the debris from a
     hydrogen bomb test. As much as 3 micrograms of einsteinium
     were produced by a complex process involving long irradiation
     of plutonium isotopes in nuclear reactors. Its chemical
     properties are those of a trivalent actinide element. --HCP61
  
     Syn: einsteinium, atomic number 99.
          [WordNet 1.5 +PJC]

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