Across
- 3. The element found in all organic compounds (6)
- 5. A type of gas in Group 18 that is unreactive under normal conditions (5)
- 7. A negatively charged particle that orbits the nucleus (8)
- 10. A substance made of two or more elements chemically combined (8)
- 12. Group 7 elements that are non-metals and very reactive (8)
- 13. A combination of substances that are not chemically bonded (7)
- 15. A piece of glassware used for holding small amounts of substances during experiments (8)
- 16. A gas that supports combustion and is released during photosynthesis (6)
Down
- 1. The gas that produces a pop sound when a lit splint is used (8)
- 2. Vertical columns in the periodic table that contain elements with similar properties (5)
- 4. The group 1 elements in the periodic table that are highly reactive (11)
- 6. Horizontal rows in the periodic table indicating energy levels of electrons (6)
- 8. A term describing how easily an element combines with others (9)
- 9. A positively charged subatomic particle found in the nucleus (6)
- 11. Speeds up a chemical reaction without being used up
- 13. A particle made from two or more atoms bonded together
- 14. A subatomic particle with no charge found in the nucleus (7)