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Across 1. The size of an element 6. A solid to a liquid 7. Most posinous element in the world 9. Joining or change of the form of an atom 12. The subject of the crossword 13. Number of protons and neutrons 16. An element reltaing to instine 18. Made from molicules 19. A psitively charged atom

Down 2. Change from liquid or gass to a solid 3. Used to fill balloons so they fly in the air 4. Made from chlorine and sodium 5. Contains two or more substances 8. A list of all the elements 10. It has no electrical charge 11. Most explosive element 12. Contains two or more elements 14. Priamry power supply in the US 15. Contains a negitive charge 17. Compound of hydrogin and oxygen