A compound is two or more different elements chemically held together by a strong force called a chemical bond . The chemical formula for water is 2 atoms of hydrogen that have bonded with 1 atom of oxygen. An ion is an electrically charged atom or group of atoms. A water ion is an electrically charged group of the molecules that make up the compound know as water. A chemical reaction is where the chemical bonds of molecules are broken and a rearrangement of atoms takes place to form new and different compounds.
Ionization is the process of breaking larger groups of molecules in to smaller groups of molecules.
Like the way salt dissolves in a glass of water. There water compounds and salt compounds are still in the glass. The water tastes salty, but the salt mineral is no longer crystallized. The salt has been ionized . Limestone is a rock made up of different types minerals, mainly calcium carbonate and magnesium .