The Periodic Table of the Elements

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Across
  1. 2. the chemical symbol for calcium
  2. 6. a column of the periodic table
  3. 7. what is the lightest element on the periodic table
  4. 9. steel is an alloy made from iron and C-----
  5. 11. a semi metal (metalloid) with chemical symbol B
  6. 12. a metal used to make roofs and nails
  7. 14. this is a reactive element that has the chemical symbol Na
  8. 16. the metallic element that is good for our bones and teeth
  9. 17. a substance made up of only one type of atom
  10. 18. a colourless gas that makes up 78% of air (N)
Down
  1. 1. a row of the periodic table
  2. 2. a metal used in plumbing and electrical wiring
  3. 3. sometimes used in sunscreen to stop us from getting sunburnt
  4. 4. a gas lighter than air used to blow up balloons
  5. 5. a gas that is used to kill germs in swimming pools
  6. 8. the most precious element on the periodic table
  7. 10. what is number 13 on the periodic table
  8. 13. this element has the chemical symbol Ag
  9. 15. a gas that is necessary for life