What is halogen? Md. Saifur Rahman The elements of group-17 in periodic table F, Cl, Br, I, and At these five elements together are called halogen.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?