C2 The periodic table

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