By: Abbey Allen
- Neon is a chemical element with symbol Ne and atomic number 10. It is in group 18 of the periodic table. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.
- Argon is a chemical element with symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas
- Krypton (from Greek: κρυπτός kryptos "the hidden one") is a chemical element with symbol Kr and atomic number 36. It is a member of group 18