Periodic Table Elements Crossword Puzzle

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Across
  1. 2. A gas used to fill balloons
  2. 6. A soft metal found in table salt
  3. 7. A gas that can make bright glowing signs
  4. 9. A soft metal used in some batteries
Down
  1. 1. The most common gas in Earth's atmosphere
  2. 2. The lightest chemical element
  3. 3. A metal that burns with a bright white light
  4. 4. An element found in pencils and diamonds
  5. 5. A lightweight metal often used to make cans
  6. 8. A gas that humans need to breathe