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Across 4. a whole number and written above the chemical symbol of the element 6. atoms of an element have the same number of protons, the same atomic number 11. patterned model after the motions of the planets 13. found inside nucleus 14. vertical coloumns in periodic table 16. he discovered the electron 18. uniform nature or character or composition through out 20. total number of protons & neutrons 22. the noble gas that precides a given element 25. Sc 26. used for picking up hot or otherwise hazardous material containing vessels 30. substances in their simplest form 31. indicates the lowest whole number ratio of the elements in a compound 34. product of radio active decay 39. used to support containers for heating 41. H 42. group B elements in periodic table 43. shows electrons embedded into a lump of positively charged sphere 44. a small area at the center of the atom 45. he discovered the proton 48. Cs 49. used for holding test tubes beaker etc. 50. lowest energy possible 51. suggested the system of representing the valence electrons of an elements

Down 1. introduced his theory about the location of the electrons of an atom 2. they are composed of 2 or more elements chemically combined in a fixed proportion 3. scattering of light by particles in suspension 5. the way in w/c electrons are arranged around the nucleus of the atom 7. the number of outermost electrons in the outermost energy level 8. it carries a negative (-) charge 9. used to transfer liquids from one container to another 10. used to spread the heat evenly 12. symbol of an element w/one or more dots representing the valence electrons of the element 15. energy keeps an electron moving around the nucleus w/in a region corresponding to the electrons energy 17. Y 19. the total number of protons & neutrons in the nucleus 21. used in the distillation process 23. student of Rutherford 24. a chemical rule of thumb that states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, 27. indicates the actual number of atoms of each elements in a molecular unit 28. horizontal rows in periodic table 29. he discovered the neutron 32. a quantum property of electrons & maybe clockwise or counter clockwise 33. it carries a positve (+) charge 34. used for heating liquids 35. came from greek word ATOMOS 36. state in w/c electron moves to a higher energy level 37. consisting of 2 or more physically distinct phases that can be identified 38. used for transferring small amounts of liquids 40. group O elements 46. used to measure large quantities of liquids 47. used as a container in small amount of solutions