Atoms and Ions

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Across
  1. 2. The neutral subatomic particle
  2. 3. The scientist who discovered neutrons
  3. 5. The scientist who calculated fixed electron shells
  4. 6. The type of atoms that lose electrons for a full outer shell
  5. 10. What we draw around a diagram of an ion
  6. 11. The maximum number of electrons that can fit in the first shell
  7. 12. The location of electrons in an atom
  8. 13. Atoms lose or gain electrons for a full ______ shell
  9. 15. The charge of an ion of the atom gains electrons
  10. 19. Rows of the periodic table
  11. 20. The centre of an atom
  12. 21. The name given to group 0, ______ gases
Down
  1. 1. The scientist who discovered the positive nucleus
  2. 4. Columns of the periodic table
  3. 7. The negative subatomic particle
  4. 8. Why scientific theories change over time
  5. 9. The positive subatomic particle
  6. 14. The scientist who discovered electrons
  7. 16. A charged particle formed when atoms lose or gain electrons
  8. 17. The maximum number of electrons that can fit in the second and third shells
  9. 18. The name given to group 1, ______ metals
  10. 19. The charge of an ion if the atom loses electrons