Chloride and Chlorine are related but different, Chlorine is an element with the chemical symbol Cl and atomic number 17. It is a highly reactive, greenish-yellow gas that forms diatomic molecules at room temperature. Chlorine is the second lightest halogen and is the most abundant halogen in the Earth's crust.

Chloride, on the other hand, is a negatively charged ion with the formula Cl-. It is formed when Chlorine atoms gain an extra electron. Chloride is the most abundant anion in the Earth's crust, and it is found in many minerals such as halite (NaCl) and sylvite (KCl). Chloride ions are also present in seawater and in the fluids of living organisms.

In summary, Chlorine is a greenish-yellow gas, while Chloride is a negatively charged ion. They are related because Chloride is formed when Chlorine atoms gain an extra electron.