Periodic Trend Help?

Question

Please put the follow sets of atoms in lowest to highest ionization energy (each letter contains 3 elements put those in order)

a. Mg, Si,S
b. Mg,Ba,Ca
c. F,Cl,Br
d. Ba, Cu, Ne
e. P, He, Si

Answer 1

a) third periodic elements: Mg < Si < S
b) Second group elements: Ba < Ca < Mg
c) 17th group elements: (for positive ionization) Br < Cl < F
d) From EMF: Ba < Cu < Ne
e) (Si and P are in the same period): Si < P < He