The Periodic Table

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Across
  1. 2. - Element showing catenation.
  2. 5. - Moving left to right in the periodic table.
  3. 7. - Energy to remove an electron from the outermost shell.
  4. 8. - Forms acidic oxides.
  5. 10. - Lightest element.
  6. 12. - Energy released on addition of an electron.
  7. 14. - Non-metal with highest electronegativity.
  8. 15. - Group 1 elements.
  9. 17. - Forms basic oxides.
  10. 19. - Softest metal.
  11. 20. - Salt formers.
Down
  1. 1. - Moving top to down in a periodic table.
  2. 3. - Green coloured gas.
  3. 4. - Lightest noble gas.
  4. 6. - Group 2 elements.
  5. 9. - Periodic property of elements.
  6. 11. - Least reactive elements.
  7. 13. - Measure of ability to attract a shared pair of electrons.
  8. 16. - Regular change in the periodic properties of elements.
  9. 18. - Mass of an atom.