MCQ
Which has the highest second ionisation potential
- ANitrogen
- BCarbon
- ✓Oxygen
- DFluorine
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$(I)\, 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^5$
$(II)\, 1s^2\, 2s^2\, 2p^3$
$(III)\, 1s^2\, 2s^2\, 2p^5$
$(IV)\, 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^1$