Which field of science studies the composition and structure of matter

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

Fred is studying a substance that is made out of only one element. this means that

Which of the following compounds would be expected to have the strongest ionic bonds? a)the compound that has b)the largest ions with the greatest charge c)the compound that has d)the largest ions with the least charge the compound that has the smallest ions with the greatest charge the compound that has the smallest ions with the least charge