- INERTGAS
- Krypton, e.g.
- Radon or neon
- Krypton or xenon
- Neon, for one
- Neon or xenon
- Helium or neon
- Krypton, for one
- Helium or krypton
- Radon, e.g.
- Molecular nitrogen, e.g.
- One won't react under normal circumstances
- Helium, for one
- Krypton, in science
- Krypton, for instance
- Item in Group 8A of the periodic table
- Noble thing
- It won't react well
- It's hard to get a reaction out of it
- Neon, e.g.
- He is one
- Helium, e.g.
- Item in the periodic table's last column
- Krypton, for example