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/ˈkɹɪptɒn/ · noun
(uncountable) The chemical element (symbol Kr) with an atomic number of 36. It is a colourless, odourless noble gas that only reacts with fluorine. It is one of the rarest gases in the Earth's atmosphere..
Use krypton when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Krypton means (uncountable) The chemical element (symbol Kr) with an atomic number of 36. It is a colourless, odourless noble gas that only reacts with fluorine. It is one of the rarest gases in the Earth's atmosphere..
Common synonyms include kr.
The opposite depends on the specific sense.
Use krypton where its definition matches the intended context.
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