The 17th element on the periodic table is Chlorine (Cl).
Chlorine is a greenish-yellow gas at room temperature and belongs to the group of halogens. It is highly reactive and is commonly used for disinfection and in the production of various chemicals. Chlorine has an atomic number of 17, which means it has 17 protons in its nucleus. The presence of these protons defines its chemical properties and behavior in reactions. Chlorine is essential in many industrial applications and also plays a crucial role in water treatment processes, helping to keep our drinking water safe by killing harmful bacteria and viruses.