Element #99

• Element discovered in 1952
• A radioactive transuranic element produced by bombarding plutonium with neutrons
• Transuranic element
• 99, in chemistry
• Radioactive element beginning to escape in minutes, I suspect

Wikipedia Word definitions in Wikipedia
Einsteinium is a synthetic element with symbol Es and atomic number 99. It is the seventh transuranic element , and an actinide . Einsteinium was discovered as a component of the debris of the first hydrogen bomb explosion in 1952, and named after Albert ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
radioactive element, discovered in the debris of a 1952 U.S. nuclear test in the Pacific, named 1955 for physicist Albert Einstein (1879-1955).

WordNet Word definitions in WordNet
n. a radioactive transuranic element produced by bombarding plutonium with neutrons [syn: Es , E , atomic number 99 ]

Wiktionary Word definitions in Wiktionary
n. A transuranic chemical element (''symbol'' Es) with atomic number 99.