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Across 3. a compound that results when a metal reacts with a nonmetal to form cations and anions. (2 words) 7. a distinct substance that is composed of the atoms of two or more elements and always contains exactly the same relative masses of those elements. 8. an lement that gives up electrons relatively easily and is typically lustrous, malleable, and a good conductor of heat and electricity. 9. a chart showing all he elements arranged in columns is such a way that all the elements in a given column exhibit similar chemical properties. (2 words) 11. Zn 12. a given compound always contains elements in exactly the same proportion by mass. (4 words) 14. positive particle. 16. C 18. an element that has both metallic and nonmetallic properties. 19. O 20. abbreviations for the chemical elements. (2 words) 23. 3.9 (5 words) 28. a Group 7 element. 29. sodium 30. 3.5 (5 words) 31. an element that does not exhibit metallic characteristics. chemically, a typical nonmetal accepts electrons from a metal. 33. a negative ion 34. 3.8 (3 words) 36. gold 38. an atom or a group of atoms that has a net positive or negative charge. 41. neutral particle. 44. negative particles. 45. a positive ion 46. a vertical colu,m of elements having the same valence electron configuration and similar chemical properties. 47. 3.1 (2 words) 48. the sum of the number od neutrons and the number of protons in a given nucleus. (2 words) 49. lead 50. a representation of a molecule in which the symbols for the elements are used to indicate the types of atoms present and subscripts are used to show the relative number of atoms. (2 words) 51. the small, dense center of positive charge in an atom.

Down 1. 3.6 (5 words) 2. Cd 4. a Group 8 element. (2 words) 5. Ne 6. a Group 2 metal. (3 words) 10. 3.11 (4 words) 13. 3.4 (3 words) 15. iron 17. 3.2 (4 words) 21. several series of elements in which inner orbitals (d or f orbitals) are being filled. (2 words) 22. F 24. the number od protons in a nucleus. (2 words) 25. molecules made up of two atoms. (2 words) 26. an atom with a dense center of the positive charge around which tiny electrons moved in a space that was otherwise empty. (2 words) 27. 3.3 (3 words) 32. Si 35. 3.7 37. a Group 1 metal. (2 words) 39. Cl 40. Pt 42. atoms with the same number of protons but different number of neutrons. 43. 3.10