The periodic table

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Across
  1. 4. The number of elements in period 1.
  2. 8. The name of the group 1 metals (2 words).
  3. 9. The only metallic element which is a liquid at room temperature and pressure.
  4. 11. The name given to the horizontal rows on the periodic table.
  5. 12. The name given to the vertical columns on the periodic table.
  6. 13. This element makes up 21% of the air we breath.
  7. 14. The element in period 3, group 3.
Down
  1. 1. The number of elements in period 2.
  2. 2. The name of the group of inert gases in group 0/8 (2 words).
  3. 3. The name of a non-metal element which is a liquid at room temperature and pressure.
  4. 5. The block of metals which is between groups 2 and 3 (2 words).
  5. 6. The name of the elements in group 7.
  6. 7. The element in period 2, group 5.
  7. 10. This metallic element burns with a lilac flame.