Across
- 2. The smallest unit of a chemical element
- 5. The central part of an atom, containing protons and neutrons (7 letters)
- 6. A negatively charged particle found in atoms
- 9. The number of protons in an atom's nucleus
- 10. A change in which one or more substances are converted into new substance
Down
- 1. Bond formed when atoms share electrons
- 3. The chemical element with the symbol 'O'
- 4. The pH level that is neither acidic nor basic
- 7. A substance that speeds up a chemical reaction Catal
- 8. Table showing all known elements