Periodic Table Elements Crossword Puzzle

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Across
  1. 4. A gas commonly used inside light bulbs
  2. 5. A light metal used in some sports equipment
  3. 6. A shiny metal that helps protect steel from rust
  4. 7. A greenish-yellow gas often used to clean swimming pools
  5. 9. A metal used to make certain types of steel
Down
  1. 1. A soft metal that helps your muscles and nerves work
  2. 2. A metal often used to make strong steel
  3. 3. A strong, lightweight metal used in airplanes and bicycles
  4. 6. A mineral important for strong bones and teeth
  5. 8. A strong metal commonly used to make tools and buildings