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element 117

noun, Chemistry, Physics.

ununseptium

[uhn-uh n-sep-tee-uh m] /ˌʌn ənˈsɛp ti əm/
noun, Chemistry, Physics.
1.
a superheavy, synthetic, radioactive element with a short half-life. Symbol: Uus; atomic number: 117.
Also called element 117.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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