C2 The periodic table

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Across
  1. 2. Horizontal row of elements on the periodic table that have the number of electrons shells
  2. 3. I have two electrons in my outermost shell what group do I belong to?
  3. 4. I have two electron shells what period do I belong to?
  4. 5. we have full outer electron shells, we are unreactive.
  5. 8. I have four electrons in my outermost shell what group do I belong to?
  6. 10. Scientist who arranged the elements by atomic weight and chemical properties. He also left gaps for undiscovered elements.
  7. 14. The maximum number of electrons that can occupy the second electron shell
  8. 16. Smallest unit of matter that has the characteristic properties of a chemical element
  9. 17. The elements found in Group 7 of the periodic table
  10. 19. A column of elements in the periodic table which have similar chemical properties
Down
  1. 1. I have a mass number of 12 and an atomic number of 6, how many neutrons do I have
  2. 2. I'm in group 1 and period 4
  3. 6. I have three electron shells what period do I belong to?
  4. 7. A particle, atom or molecule with a net electrical charge
  5. 8. I have five electrons in my outermost shell what group do I belong to?
  6. 9. Elements in Group 1 of the periodic table
  7. 11. I'm in group 7 and period 3
  8. 12. I have a mass number of 12 and an atomic number of 6, what element am I?
  9. 13. The maximum number of electrons that can occupy the third electron shell
  10. 15. The maximum number of electrons that can occupy the first electron shell
  11. 18. The centre of an atom