Group 1 Group 3 Group 5 Group 7
Green, brown and black Green, blue and brown Red, brown and black Red, blue and black
Solid, liquid and gas Liquid, gas and solid Gas, solid and liquid Gas, liquid and solid
Brighter More magnetic Less magnetic Less reactive
As a pain killer To help divers breathe under water To kill bacteria in water In airships
In toothpaste In power stations In jet engines As an alternative to coffee
Popcorn Candyfloss Caramel Hydrochloric acid