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  • Which of the following is not noble gas?
Multiple choice

Which of the following is not noble gas?

  1. Krypton

  2. Xenon

  3. Radon

  4. Sodium

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium is an alkali metal, not a noble gas. Noble gases are found in Group 18 of the periodic table, while sodium is in Group 1.

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