The Periodic Table

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