unnilhexium

[ yoo-nil-hek-see-uh m ]

/ ˌyu nɪlˈhɛk si əm /

noun Chemistry, Physics.

former name of seaborgium. Symbol: Unh

Nearby words

unnecessary, unneeded, unnerve, unnerving, unnilennium, unnilhexium, unniloctium, unnilpentium, unnilquadium, unnilseptium, unnoticeable

Origin of unnilhexium

1975–80; < Latin ūn(us) one + nīl nothing + Greek héx six + New Latin -ium -ium

Also called element 106.

Definition for unnilhexium (2 of 3)

seaborgium

[ see-bawr-gee-uh m, see-bawr- ]

/ siˈbɔr gi əm, ˈsi bɔr- /

noun Chemistry, Physics.

a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Sg; atomic number: 106.

Origin of seaborgium

named after U.S. chemist Glenn T. Seaborg; see -ium

Formerly unnilhexium, element 106.

Definition for unnilhexium (3 of 3)

element 106

noun Chemistry, Physics.

seaborgium.

Origin of element 106

First recorded in 1975–80

Formerly unnilhexium.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for unnilhexium

seaborgium

/ (ˈsiːbɔːɡɪəm) /

noun

a synthetic transuranic element, synthesized and identified in 1974. Symbol: Sg; atomic no: 106

Word Origin for seaborgium

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

Science definitions for unnilhexium

seaborgium

[ sē-bôr′gē-əm ]

Sg

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.