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From the list B, C, O, F, Ne, P, Si — how many elements have a first ionisation energy (IE1) greater than that of nitrogen (N)?

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

Correct answer: 2

Solution

Only F (1681 kJ/mol) and Ne (2081 kJ/mol) have IE1 greater than N (1402 kJ/mol); all other listed elements — B, C, O, P, Si — have lower IE1 than N.

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