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einsteinium
(redirected from Athenium)

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.06 sec.
einsteinium /ein·stei·ni·um/ (Es) (in-sti´ne-um) a chemical element, at. no. 99.
ein·stein·i·um (n-stn-m)
n. Symbol Es
A radioactive transuranic element synthesized by neutron irradiation of plutonium or other elements. Its longest-lived isotope is Es 254 with a half-life of 275 days. Atomic number 99.

einsteinium
a chemical element, atomic number 99, atomic weight 254, symbol Es. See Table 6.

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