halogens

• The elements in Group 7 are called halogens. They belong to the column second from right in the periodic table.
• The halogens are non-metals with molecules which each contain two atoms.
• They have low melting points and boiling points,
• They are poor conductors of heat and electricity.
• They react with metals to make ionic compounds in which the halide ions have a -1 charge.

• As you go down the group the halogens' melting and boiling points get higher, their colour becomes darker, and they become less reactive. A more-reactive halogen can displace a less-reactive halogen from its salt dissolved in water.