unnilseptium

[ yoo-nil-sep-tee-uh m ]
/ ˌyu nɪlˈsɛp ti əm /

noun Chemistry, Physics.

former name of bohrium.Symbol: Uns

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Also called element 107.

Origin of unnilseptium

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

Words nearby unnilseptium

unnilennium, unnilhexium, unniloctium, unnilpentium, unnilquadium, unnilseptium, unnoticeable, unnoticed, unnumbered, uno, unobserved

Definition for unnilseptium (2 of 3)

bohrium
[ bawr-ee-uh m, bohr- ]
/ ˈbɔr i əm, ˈboʊr- /

noun Chemistry, Physics.

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

Origin of bohrium

named after Danish physicist Niels Bohr; see -ium

Definition for unnilseptium (3 of 3)

element 107

noun Chemistry, Physics.

bohrium.
Formerly unnilseptium.

Origin of element 107

First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for unnilseptium

bohrium
/ (ˈbɔːrɪəm) /

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

Scientific definitions for unnilseptium

bohrium
[ bôr′ē-əm ]

Bh

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.