Periodic Table Crossword

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Across
  1. 3. This is the only nonmetal in Group 1.
  2. 7. The element iodine is found in this family of elements.
  3. 9. This is the heaviest discovered element.
  4. 12. This metal in Period 7 produces energy in nuclear power plants.
  5. 13. This is the chemical symbol for helium.
  6. 15. This is another name for elements created in a laboratory.
  7. 17. Iridium is an example of this kind of metal.
  8. 18. This is the only metal naturally in liquid form.
  9. 19. This is the most common element.
  10. 20. This is the most common gas in the atmosphere.
  11. 22. This is the chemical symbol for lead.
  12. 25. Many metalloids are used to make these.
  13. 28. Metals are good conductors of this.
  14. 29. This compound combines two dangerous elements to make table salt.
  15. 30. This man is credited with devising the periodic table.
Down
  1. 1. This layer in the upper atmosphere screens us from the sun's radiation.
  2. 2. This atom has a positive charge
  3. 4. This is another name for a column on the periodic table.
  4. 5. Lanthanides and Actinides are sometimes referred to as this.
  5. 6. This is the chemical symbol for arsenic.
  6. 8. The first group in the periodic table is called _______ metals.
  7. 10. This atom has NO charge
  8. 11. This atom has a negative charge
  9. 14. This gas element shares a name with a type of light.
  10. 16. The periodic table is organized by this.
  11. 21. This is the chemical symbol for radium.
  12. 23. This group of elements has 8 valence electrons.
  13. 24. This is the chemical symbol for gold.
  14. 26. This is the number of valence electrons elements want to have to make them happy.
  15. 27. All living things contain compounds made from this element.