C2 The periodic table

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Across
  1. 1. I'm in group 7 and period 3
  2. 3. The elements found in Group 7 of the periodic table
  3. 5. Smallest unit of matter that has the characteristic properties of a chemical element
  4. 7. Horizontal row of elements on the periodic table that have the number of electrons shells
  5. 8. Scientist who arranged the elements by atomic weight and chemical properties. He also left gaps for undiscovered elements.
  6. 10. The maximum number of electrons that can occupy the second electron shell
  7. 11. I'm in group 1 and period 4
  8. 12. The centre of an atom
Down
  1. 2. A particle, atom or molecule with a net electrical charge
  2. 4. A column of elements in the periodic table which have similar chemical properties
  3. 5. Elements in Group 1 of the periodic table
  4. 6. The maximum number of electrons that can occupy the first electron shell
  5. 9. The maximum number of electrons that can occupy the third electron shell