Across
- 2. Sub-atomic particles with no charge
- 4. A row in the periodic table
- 6. These small units make up all forms of matter including living and non living things.
- 8. Sub-atomic particles with positive charge
- 11. Reactions that release energy
- 13. We cannot live without this gas
- 14. A table in which elements are organised
- 17. The acid that is produced in our stomach
- 18. This has the chemical symbol of Au
- 19. This has the chemical symbol of Mg
- 20. Substance that speeds up a reaction without itself taking part in it
- 21. Lightest elment
- 23. It is equal to the number of protons
Down
- 1. What we get when we add number of protons and neutrons
- 3. Reactions that consume energy
- 5. They are sub-atomic particles having negative charge
- 7. They are made up of two or more types of atoms.
- 9. Increasing ______ will speed up the rate of a chemical reaction
- 10. Reaction type in which things burn
- 12. A change in which new substance is formed
- 15. A column in the periodic table
- 16. These are either positively charged or negative charged
- 22. Things which react are known as _______