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Across 4. a characteristic used to identify a substance 7. he discovered the nucleus in an atom 10. he proposed the three part atomic theory 15. a blend of two or more kinds of matter, each of which retains its own identity 16. closeness of a set of measurements of the same quantity 17. he said that electromagnetic radiation has a dual wave-particle nature 20. lowest energy state of an atom 24. he proposed an equation that treated electrons in atoms as waves 25. data that is descriptive 29. group 17 nonmetals 30. group two metals 32. mutual attraction between then nuclei and valence electrons of different atoms that binds the atom together 38. refers to emissions of electrons from a metal when light shines on it 39. a broad generalization that explains a body of facts 41. can be beaten into sheets 42. volume and mass and density are examples of these 43. molecule of only two atoms 44. neutral group of atoms that are held together by covalent bonds

Down 1. the central part of an atom containing protons and neutrons 2. the number of quantum numbers 3. he stated that electrons move like planets around the sun 5. a negative subatomic particle 6. the total number of protons and neutrons in the nucleus 8. he called nature's basic particle the atom 9. group 18 nonmetals 11. a testable statement 12. it states that the chemical properties of elements can be grouped according to periodic functions 13. horizontal row on the periodic table 14. these compounds share electrons 18. waves overlap 19. data that uses numbers 21. ions rearrange themselves so they have the lowest possible potential energy 22. group one metals 23. this principle states that no two electrons can have the same set of quantum numbers 26. small specific packets of energy 27. can be drawn into wires 28. these compounds are formed by the transfer of electrons 31. the number of protons in the nucleus of an element 33. 3-D regions around the nucleus that indicates the probable location of an electron 34. pure substance that can't be broken down 35. this principle says that an electron occupies the lowest energy level first 36. bonding in molecules or ions that can't be correctly represented by a single Lewis structure 37. any substance that has a definite composition 40. a positive subatomic particle