alleryWhy are the noble gases very stable chemically?
AThey are radioactive
BThey have completely filled valence shells
CThey are denser than air
DThey have negative electron affinity
Answer & Solution
Correct answer: B. They have completely filled valence shells
1. Noble gases occupy Group 18 of the periodic table.
2. They have either 2 (He) or 8 valence electrons.
3. A filled valence shell needs no additional electrons.
4. So they form bonds only under extreme conditions.
5. Hence chemical stability comes from filled valence shells.
_Source: syllabus Science Ch 5 'Periodic Classification of Elements'_
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