Why is krypton a pure substance?

Answer 1

Krypton is considered a pure substance because it is a chemical element with the symbol Kr and atomic number 36, consisting entirely of krypton atoms. As a noble gas, it does not readily react with other elements, which means it exists in a stable, uncombined form. In its gaseous state, krypton has a uniform composition and distinct physical properties, making it a pure substance rather than a mixture.