General Science


  • A colorless noble gas whose atomic number is 18. It has over 35 known isotopes, of which 6 are stable. It applications in electronics include its use in lasers, as a gas filler in bulbs and lamps, and in high-speed photography. Its chemical symbol is Kr.
  • chemical symbolKr

Information & Library Science

  • abbreviation in Internet addresses, the top-level domain for South Korea