element 115
American
[el-uh-muhnt wuhn fif-teen]
/ ˈɛl ə mənt ˈwʌn ˌfɪfˈtin /
noun
element 115
Scientific
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An artificially produced radioactive element whose most stable confirmed isotopes have mass numbers of 287 and 288 and half-lives of less than one second.
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Also called ununpentium
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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.
