Periodic Table of Elements Crossword

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Across
  1. 3. C
  2. 5. In general, period number indicates the number of electron _________ in neutral atoms of the elements in that period.
  3. 7. Li
  4. 9. How elements are DISPLAYED on the periodic table: _________ symbols.
  5. 13. Al
  6. 14. Be
  7. 16. Na
  8. 17. K
  9. 21. The group of elements that share properties associated with metals and nonmetals.
  10. 24. Cl
  11. 26. O
  12. 27. For metals, reactivity __________ as you go from left to right across a period.
  13. 29. Ne
  14. 30. He
  15. 32. F
  16. 33. In general, group number indicates the number of ________ electrons in the neutral atoms of elements belonging to that group.
  17. 35. Group 1: ________ metals
  18. 36. Ar
  19. 37. A row in the periodic table.
Down
  1. 1. Group 18 elements: _________ gases; these elements are very stable and do not react easily.
  2. 2. A column in the periodic table; also referred to as a group.
  3. 4. To calculate the number of ________ in an atom for an element, subtract the atomic number from the atomic mass.
  4. 6. Elements in the same group have __________ physical and chemical properties.
  5. 8. Ca
  6. 10. Group 17 elements, which are very reactive and dangerous.
  7. 11. Mg
  8. 12. The units for atomic mass.
  9. 15. H
  10. 17. P
  11. 18. For non-metals, reactivity __________ as you go from left to right across a period.
  12. 19. For a neutral atom of an element, the atomic number and number of protons also equals the number of ________.
  13. 20. For a neutral atom of an element, the atomic number equals the number of ________.
  14. 22. Groups 3 through 12: _________ metals
  15. 23. Si
  16. 25. N
  17. 28. S
  18. 31. Group 2: __________ earth metals
  19. 34. B
  20. 35. Elements in the periodic table are arranged in order of increasing ________ number.