element 117


Uus
  1. 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. Also called ununseptium See Periodic Table.

Words Nearby element 117

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