The Atom

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Across
  1. 4. Shows ion charge
  2. 11. Total number of protons and neutrons
  3. 12. Particle responsible for isotopes, Carries no charge
  4. 13. Charged atom, Carries negative charge
  5. 15. Substance made of one type of atom
  6. 17. Determines element identity, Carries positive charge
  7. 18. One- or two-letter representation of an element
  8. 19. Number of protons in an atom
  9. 22. Experiment that discovered nucleus
  10. 23. Center of the atom
  11. 24. Developed first atomic theory
Down
  1. 1. Negatively charged ion
  2. 2. Discovered nucleus
  3. 3. Smallest unit of an element
  4. 5. Result of gaining or losing electrons, Shown as + or –
  5. 6. Early atomic model
  6. 7. Changes the atoms charge, Negatively charged particle
  7. 8. Positively charged ion
  8. 9. Discovered the electron
  9. 10. Proposed idea of atoms
  10. 13. Atoms with same protons but different neutrons
  11. 14. Electrical property of particles
  12. 16. Helps determines the atoms mass, Neutral subatomic particle
  13. 20. Proposed energy levels
  14. 21. Number showing how many atoms are present