unnilseptium

[yoo-nil-sep-tee-uh m]

noun Chemistry, Physics.

former name of bohrium.Symbol: Uns

Origin of unnilseptium

< Latin ūn(us) one + nīl nothing + sept(em) seven + New Latin -ium -ium

Also called element 107.

bohrium

[bawr-ee-uh m, bohr-]

noun Chemistry, Physics.

a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Bh; atomic number: 107.

Origin of bohrium

named after Danish physicist Niels Bohr; see -ium

Formerly unnilseptium, element 107.

element 107

noun Chemistry, Physics.

bohrium.

Origin of element 107

First recorded in 1975–80

Formerly unnilseptium.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for unnilseptium

bohrium

noun

a transuranic element artificially produced in minute quantities by bombarding 204 Bi atoms with 54 Cr nuclei. Symbol: Bh; atomic no: 107Former names: element 107, unnilseptium

Word Origin for bohrium

C20: after Neils Bohr

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

unnilseptium in Science

bohrium

[bôr′ē-əm]

A synthetic, radioactive element that is produced by bombarding bismuth with chromium ions. Its most long-lived isotopes have mass numbers of 261, 262, and 264 with half-lives of 11.8 milliseconds, 0.1 second, and 0.44 second, respectively. Atomic number 107. See Periodic Table.