1. elements in the group.
2. characteristic of elements in the group.
3. property of elements in the group. this means the general properties for every elements in the group not just an individual.
4. important applications of elements in the group.
5. other interesting information you could find.
Krypton mixes with argon as the fill gas of energy saving fluorescent lamps.
Krypton's multiple emission lines make ionized krypton gas discharges appear