Ionization Trends!!?

Question

Arrange In increasing ionization energy.

Ar Cl Li Na P


there are exceptions to the rules I just can't remember what they are


A. Ar B. P C. Na < Li < P < Cl < Ar
D. P < Cl < Ar < Li < Na
E. Cl

Answer 1

Answer C - lower ionisation energies are found at the bottom of a Group and at the left hand end of a Period.