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Which is the lightest noble gas?

AArgon
BHelium
CNeon
DXenon
Answer & Solution
Correct answer: B. Helium
1. Noble gases occupy Group 18. 2. The first member at the top of Group 18 is helium. 3. Helium has atomic mass 4. 4. So helium is the lightest noble gas. _Source: Selina Concise Chemistry ICSE Class 9, Ch 5 'The Periodic Table'_
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