alleryWhy do noble gases generally show ZERO electron affinity?
AThey have no valence electrons
BTheir outer shells are already full
CThey are radioactive
DThey have low atomic mass
Answer & Solution
Correct answer: B. Their outer shells are already full
1. Electron affinity is the energy released on gaining an electron.
2. A noble gas already has a stable, fully filled outer shell.
3. Adding another electron would force it into a higher empty shell.
4. This is energetically unfavourable.
5. So noble gases do not release energy when gaining an electron.
6. Their electron affinity is effectively zero.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 1 'Periodic Table' (aplustopper.com extract)_
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