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| Matching Terms: | atomic number 3, atomic number 30, atomic number 31, atomic number 32, atomic number 33, atomic number 34, atomic number 35, atomic number 37, atomic number 38, atomic number 39 | ||
| Definition: | [n] a colorless element that is one of the six inert gasses; occurs in trace amounts in air | ||
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| Synonyms: | Kr, krypton | ||
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| See Also: | air, argonon, chemical element, element, inert gas, noble gas | ||
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