Halogens are hazardous to human life, yet they can also be very useful. How do they react when they meet other elements?
- The halogens are the elements in Group 7 of the periodic table.
- The halogens are non-metals and are very reactive.
- The melting and boiling points of the halogens increase down the group.
- The reactivity of the halogens decreases down the group.