Question
How do noble gases occur?
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Answer
- The most important source of noble gases is the atmosphere where they make up about $1 \%$ by volume of air. Argon is the major constituent.
- All noble gases occur in nature except Radon. Radon is a decay product of radioactive ${ }^{226} Ra$..
- Helium on a large scale is obtained from natural gas. Helium and neon are found in the minerals pitchblende, monazite and cleveite.
- Xenon and Radon are the rarest noble gases.
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