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Across 3. The only liquid metal at room temperature 5. The name given to the metals found between groups 2 and3 7. The number of protons + neutrons 12. The temperature that a liquid turns to a gas 14. A group of very unreactive elements 15. Added to drinking water in Scotland to help stop tooth decay 18. This is the name given to a substance used to speed up chemical reactions. 19. An uncharged charged particle found in the nucleus of an atom 20. Humans breathe in this gas during respiration

Down 1. A positively charged particle found in the nucleus of an atom 2. The only liquid non-metal at room temperature 4. The number of protons 6. A disinfectant used in swimming pools 8. The temperature that a solid turns to a liquid 9. Only made from one type of atom. 10. A negatively charged particle found outside the nucleus of an atom 11. This element has an atomic number of one 13. The name given to group seven elements 16. These elements are found on the right hand side of the Periodic Table 17. The smallest aprt of an element that can exist.