Rank the following in terms of increasing first

Question

ionization energy.
1. Na, Mg, N, O, F
2. F, N, O, Mg, N
3. F, O, N, Mg, Na
4. O, N, F, Na, Mg
5. Na, Mg, O, N, F

Answer 1

http://en.wikipedia.org/wiki/Periodic_trends
Is this 1 question or 5 questions?
You need the rules. Scroll down this link to ionization potential and read about the trend.