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Across 2. outside the nucleus; negative charge 4. one of 20 naturally occuring compounds that combine to form proteins 7. in the nucleus; positive charge 9. group 2 10. biological polymer of bonded amino acids 11. ion made of two or more covalently bonded atoms 14. group 18 15. simplest chemical formula of a compound 17. a column on the periodic table; also called "family" 18. arrangement of bonded atoms or ions 21. the mass of one mole of a substance 22. group 1 24. covalently bonded compound that contains carbon 26. group 17 27. organic compound made of carbon, hydrogen, and oxygen 28. bond formed by the attraction of opposite charges 29. bond formed by positively charged metal ions and electrons around them 30. the counting unit of chemistry

Down 1. angle formed by two bonds to the same atom 3. ion with a positive charge 5. chemical formula that gives the actual numbers of atoms in one molecule 6. groups 3 through 12 8. organic compound that has important role in living things 10. a row on the periodic table 12. ion with a negative charge 13. in the nucleus; no charge 16. average distance between nuclei of two bonded atoms 19. bond formed when electrons are shared 20. attractive force that holds chemicals together 23. large organic molecule made of many smaller units 25. same atomic number, different mass