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Across 5. attraction between positive and negative ions (2 words) 6. negatively charged ion 9. solution that coducts electricity 11. having more than one possible ionic charge 15. measurement of an atom from the nucleus to the edge (2 words) 16. positively charged ion 17. three dimensional shape of fixed ion pairs (2 words) 19. simple way to figure out the ionic formula (2 words) 20. diagram showing only outermost electrons (3 words)

Down 1. negative electrode 2. naming system that uses roman numerals to show charge on metals (2 words) 3. force of attraction between atoms (2 words) 4. substance held together by ionic bonds (2 words) 6. positive electrode 7. diagram using lines to show shared electrons (2 words) 8. outermost energy shell (2 words) 10. flow of electrons 12. examples are Cr, Fe, W (2 words) 13. outermost electrons (2 words) 14. compound containing only two elements (2 words) 18. hard crystal of monetary value