K
- K. Barry Sharpless
- Kainite
- Kalsilite
- Kamacite
- Kaolinite
- Karl Ziegler
- Kary Mullis
- Keilhauite
- Kelvin
- Kenichi Fukui
- Kernite
- ketone
- kilogram per cubic metre
- kilojoule per mole
- Kimberlite
- Kinetics
- Kobellite
- Koichi Tanaka
- Krantzite
- krypton
- Kunzite
- Kurt Alder
- Kurt Wüthrich
- Kyanite
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