What are the five elements in group7 known as and are they metals or non - metals?

At room temperature what colour are chlorine, bromine and iodine?

What are the uses of iodine and chlorine?

Why do halogens become less reactive as we go down the group?

Fluorine is the first element in Group 7, and is therefore the most reactive in the group. This means that it will displace all of the other halogens from an aqueous solution of their metal halides. Astatine is the fifth element in group 7. Describe astatines properties and how reactive it would be and whether it would displace any other elements?

What happens to the physical properties of halogens as we go down the group?

The halogen s gain one electron to form a negative ion. What is this called and how would it be written (Use fluorine ions as an example) ?