Questions on Trends of Periodic Table

Question 1

does electron affinity decrease or increase down a column, and why?

Answer 1

decreases - # of energy levels increases, so less attraction between e- and nucleus, so takes energy = endothermic

Question 2

does electron affinity decrease or increase across a period

Answer 2

of protons increase so more attraction between e- and nucleus, energy change = more exothermic

Question 3

what influences lattice enthalpy? which is the most influencial?

Answer 3

charge of the ion (such as 2+ or 1-) and size of the ion. the charge matters more