Science crossword

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Across
  1. 3. a way of grouping elements in rows
  2. 4. suggested the idea of different energy levels
  3. 6. most of the periodic table is in this state at 25°c
  4. 10. group 2
  5. 11. group 1
  6. 12. his atomic model is likened to a plum pudding
Down
  1. 1. group 18
  2. 2. discovered the neutron
  3. 3. the right corner of the periodic table is in this state at 25°c
  4. 5. first suggested the idea of atoms
  5. 7. a way of grouping elements in columns
  6. 8. only three elements are in this state at 25°c
  7. 9. located in the centre of the periodic table