Chlorine has 17 protons and electrons and 18 neutrons.
Chlorine in salt
Chlorine is very present on the sodium, or salt, in our ocean. Together, they help the ocean have its salty taste.
Carl Wilheim Scheel and Sir Humphrey Davey were the first to spot chlorine. Together, they studied it and named it Chlorus, after the greek term meaning yellow-green. Davey also helped identify Potassium, Sodium, Barium and Iodine.
How he was found
Chlorine was last seen in the oceans water and the Earth's crust. It is rumored that he was with the non metals in the period 3 column.
Chlorine does not exist on its own and is always mixed with one of his pals. Hydrogen and chlorine make Hydrogen Chloride. When mixed with Fluorine and Carbon, it creates Chlorofluorocarbons, which is a synthetic material usually found in liquid form.
NaCL + H2O => NOH + HCL