When an atom of Calcium (Ca) bonds with an atom of Oxygen (O), the Calcium atom will have which ionic charge? +1

Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

What is the main reason why some developing countries fear the increase the free trade policies around the world?