C2 The periodic table

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Across
  1. 2. smallest unit of matter that has the characteristic properties of a chemical element
  2. 4. I'm in group 7 and period 3
  3. 5. the maximum number of electrons that can occupy the third electron shell
  4. 7. the maximum number of electrons that can occupy the second electron shell
  5. 9. horizontal row of elements on the periodic table that have the number of electrons shells
  6. 11. the centre of an atom
  7. 12. I'm in group 1 and period 4
Down
  1. 1. the elements found in Group 7 of the periodic table
  2. 3. elements in Group 1 of the periodic table
  3. 6. the maximum number of electrons that can occupy the first electron shell
  4. 8. a column of elements in the periodic table which have similar chemical properties
  5. 10. a particle, atom or molecule with a net electrical charge