einsteinium /ein·stei·ni·um/ (Es) (īn-sti´ne-um) a chemical element, at. no. 99.
einsteinium (Es)
ein·stein·i·um ( n-st n - 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 (Es)
[īnstī′nē·əm]
Etymology: Albert Einstein, German-born physicist and Nobel laureate, 1879-1955
a synthetic transuranic metallic element. Its atomic number is 99. The mass of its longest-lived, best-known isotope is 254. Einsteinium was first found in the debris from a hydrogen bomb explosion. It decays rapidly into berkelium.
einsteinium
a chemical element, atomic number 99, atomic weight 254, symbol Es. See Table 6.
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