What are the Halogens?

What are the Halogens?

The Halogens are a highly reactive group of Non-Metals found in the 17th family of the Periodic Table. Fluorine, Chlorine, Bromine and Iodine are stable Halogens. Astatine is unstable and radioactive. A Halogen has seven electrons in its outer orbital. In chemical reactions, Halogens gain one more electron, forming ions with a charge of -1. A Halogen only needs one more electron to fill its outer orbital. Therefore Halogens often react with Alkali Metals. [LM] {CI}