C2 The periodic table

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