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Among the following species, how many have a first ionisation energy greater than that of oxygen (O)? N2, O, N, F, He, Ne, Na, K, O2

1. 2
2. 3
3. 4
4. 5

Correct answer: 5

Solution

Five species — N2, N, F, He, Ne — have first ionisation energies higher than that of oxygen (13.6 eV). O, Na, K, and O2 do not.

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