The reaction releases a lot of heat as the ionic compound sodium chloride is formed. A sodium and chlorine atom are near each other. An electron from each atom feels the attraction from the other atom ...

The atom is more stable if it has a full outer ... A positive sign is added to the symbol for sodium, Na +. Ions with greater charge include a number in their symbol, for example Al 3+ (which ...

For example, the atomic number of sodium is 11. Every sodium atom has 11 protons and 11 electrons. It has 11 positive charges and 11 negative charges. The mass number of an atom is its total ...