Across
- 4. Neutral particles
- 5. Substances that help a reaction proceed faster.
- 8. Both metallic and non-metallic properties
- 9. Takes place when two or more substances combine to form new substances
- 11. Pure substances formed as a result of the attraction between ions
- 14. Chemical reaction that absorbs heat energy
- 18. Negative ion
- 19. Can be a solid or a gas
- 20. Number above the element's symbol on the left
- 23. Mass of one atom of an element
- 24. Atom or a group of atoms that has become electrically charged because it has lost or gained electrons.
- 25. Most stable and unreactive elements.
Down
- 1. New materials produced by the reaction
- 2. Materials at the start of a reaction
- 3. Chemical reaction that releases heat energy
- 6. Most reactive non-metals
- 7. Slow chemical change
- 10. Chemical reaction that occurs when oxygen reacts with a new substance to form a new substance and give off energy
- 12. Positive ion
- 13. Good insulators
- 15. Negative atoms
- 16. Represents the sum of the number of protons and neutrons in an atom
- 17. Chemical reaction that takes place in the cells in your body.
- 21. Shiny, malleable and ductile
- 22. Positive atoms