Assertion: natural krypton | /r/HasProperty | krypton-84 57.0 percent
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Source sentences:
text: Natural krypton is a mixture of six stable isotopes : krypton-84 (57.0 percent), krypton-86 (17.3 percent), krypton-82 (11.6 percent), krypton-83 (11.5 percent), krypton-80 (2.25 percent), and krypton-78 (0.35 percent).