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11
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Across 3. negatively charged ions 8. A + B -> A B 11. a subatomic particle with no charge 14. Fe : 15. sodium, iron, oxygen, lead 18. a positively charged subatomic particle 20. the outtermost electrons in an atom 21. a negatively charged subatomic particle 22. when CO2 and H2O are the products 23. a substance formed in a chemical reaction

Down 1. atoms or groups of atoms with a charge 2. AB -> A+B 4. the central portion of an atom 5. the outtermost level with electrons on it 6. high melting point, electrolytes, hard, brittle,crystal 7. the orgainization of elements 8. a single element replaces another element in a compound 9. low melting point, non-electrolytes, soft powders 10. Atoms become "happy" when this rule is in place 12. AB + CD -> CB + AD 13. bonds that make other atoms "happy" 16. the smallest particle of an atom 17. positively charged ions 18. mmHg or atm 19. a starting substance in a chemical reaction