Chemistry CW 1

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Across
  1. 3. A chart of all known elements that scientists reference when working with atoms or molecules
  2. 4. Ag
  3. 10. elements in group 18 of the periodic table that share similar properties such as a full outer electron shell
  4. 11. U
  5. 14. Al
  6. 17. Pb
  7. 18. An abbreviation for the name of an element on the periodic table.
  8. 21. when an element has more than one possibility for the number of neutrons
  9. 23. The average mass of the nucleus of that element.
  10. 25. ________ electron is a located in the outermost shell of an atom
  11. 29. Repeating rows of the periodic table that demonstrate patterns of how elements are arranged.
  12. 31. elements in group 17 of the periodic table that need only one electron to complete its outer electron shell
  13. 32. A subatomic particle with no charge located at the center of an atom.
  14. 34. Li
  15. 36. Characteristics of elements that help to identify what they are.
  16. 40. C
  17. 41. K
  18. 43. Elements arranged in vertical columns of the periodic table that share the same properties.
  19. 45. Si
  20. 46. _______ family are the elements in group 16
Down
  1. 1. Cr
  2. 2. A subatomic particle of an atom that is negatively charged and orbits the nucleus extremely fast.
  3. 5. I
  4. 6. ________ family are the elements in group 14
  5. 7. someone who studies chemistry
  6. 8. He
  7. 9. The basic unit of an element.
  8. 10. ________ family are the elements in group 15
  9. 12. elements in group 1 of the periodic table that are characterized as metals and only have one valence electron
  10. 13. H
  11. 15. this is where the electrons in an atom are found
  12. 16. ________ family are the elements in group 13
  13. 19. Sn
  14. 20. Na
  15. 22. The number of protons in the nucleus of each element.
  16. 24. Anything that has mass and takes up space.
  17. 26. Cl
  18. 27. Two or more atoms bonded together.
  19. 28. Ne
  20. 30. Mg
  21. 33. A positively charged subatomic particle located at the center of an atom.
  22. 35. Ca
  23. 37. O
  24. 38. Elements that are good conductors of electricity and thermal energy and are often solid at room temperature.
  25. 39. elements in group 2 of the periodic table that are characterized as metals and only have two valence electrons
  26. 42. Protons and neutrons clump together at the center of an atom to form the ___________ of an atom.
  27. 44. P