Name an element in Group 1A or Group 2A that is an important constituent of each of the following substances:
(a) Remedy for acid indigestion.
(b) Coolant in nuclear reactors.
(c) Epsom salt.
(d) Baking powder.
(e) Gunpowder.
(f) A light alloy.
(g) Fertilizer that also neutralizes acid rain.
(h) Cement.
(i) Grit for icy roads. You may need to ask your instructor about some of the items.