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Kr |
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Kr krypton.
Kr, symbol for the element krypton. krypton (Kr) [krip´ton] a chemical element, atomic number 36, atomic weight 83.80. (See Appendix 6.) krypton 81m an unstable radioactive isotope of krypton having a half-life of 13 seconds and emitting gamma rays. It is used in pulmonary ventilation studies to evaluate regional function.
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