alleryWhich noble gases are the rarest of the group?
AHelium and neon
BArgon and neon
CArgon and radon
DXenon and radon
Answer & Solution
Correct answer: D. Xenon and radon
1. Argon is the most plentiful of them in air.
2. Two others are named as the rarest.
3. They are xenon and radon.
_Source: syllabus Chemistry, Chapter 7, The p-Block Elements._
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