Periodic Table Crossword

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Across
  1. 4. any of the six chemical elements that comprise Group 2
  2. 9. The number of protons an atom has
  3. 11. The electrons on the outer orbital
  4. 14. Bond between a metal and nonmetal
  5. 16. Number of protons plus number of neutrons
  6. 17. Elements that are shiny, good conductors, and found on the left on the Periodic Table
  7. 18. Bond between nonmetals
  8. 21. Elements that are dull, brittle, and often a gas at room temperature
Down
  1. 1. intermediate between those of metals and solid nonmetals
  2. 2. Atoms of the same element that retains the element properties
  3. 3. Columns (up,down)
  4. 5. occupying Group IA
  5. 6. a substance made up of two or more different chemical elements combined in a fixed ratio
  6. 7. material formed by chemically bonding two or more chemical elements
  7. 8. any of the gaseous elements helium, neon, argon
  8. 10. an atom or molecule with a net electric charge
  9. 12. Extremely reactive in element form; mostly extracted from water
  10. 13. Rows (across)
  11. 15. an uncharged atomic particle
  12. 19. The smallest particle of an element that retains the element properties
  13. 20. An electric charge