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Which is not a noble gas? a)argon b) helium c) nitrogen d) krypton ​
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Which is not a noble gas?
a)argon
b) helium
c) nitrogen
d) krypton ​

User Imakeitpretty
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You can look at the periodic table to answer this question. Noble gasses are the elements on the rightmost side of the table. Helium, Argon, and Krypton are all at the rightmost side of the table which leaves only nitrogen to be the right answer.
User Micahscopes
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