element 117
American
[el-uh-muhnt wuhn sev-uhn-teen]
/ ˈɛl ə mənt ˈwʌn ˌsɛv ənˈtin /
noun
element 117
Scientific
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An artificially produced radioactive element whose most stable confirmed isotopes have mass numbers of 293 and 294, with the lighter, more stable isotope having a half-life of less than 80 milliseconds.
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Also called ununseptium
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See Periodic Table
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
