Chemistrymedium · Past Paper
The electronic configuration of an ion \(O^{2-}\) is:
A2, 6
B2, 8
C2, 4
D2, 8, 2
✓ Correct Answer: B — 2, 8
Oxygen (Z=8) gains 2 electrons to form an oxide ion, giving it 10 electrons total (2, 8).
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