- former name of seaborgium. Symbol: Unh
Origin of unnilhexium
Also called element 106.
[see-bawr-gee-uh m, see-bawr-]
- a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Sg; atomic number: 106.
Origin of seaborgium
Formerly unnilhexium, element 106.
Origin of element 106
First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a synthetic transuranic element, synthesized and identified in 1974. Symbol: Sg; atomic no: 106
C20: named after Glenn Seaborg
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- A synthetic, radioactive element that is produced by bombarding californium with oxygen ions or bombarding lead with chromium ions. Its most long-lived isotopes have mass numbers 259, 261, 263, 265, and 266 with half-lives of 0.9, 0.23, 0.8, 16, and 20 seconds, respectively. Atomic number 106. See Periodic Table.
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