Atomic Structure- Physical Science

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Across
  1. 1. Positive subatomic particle
  2. 2. Equals the protons plus neutrons.
  3. 3. Original name given to electron stream by Thomson
  4. 7. thought all substances were made of 4 elements
  5. 11. Neutrons have ________ charge.
  6. 13. Lowest energy state of an atom
  7. 15. The energy levels in Bohr's model are often called ____________.
  8. 18. Thomson's model of the atom.
  9. 20. equals the number of protons minus the number of electrons.
  10. 21. Negative subatomic particle
  11. 22. Neutral subatomic particle
  12. 23. Bohr's model of the atom was called the ____________ model.
  13. 27. came up with the idea of "atoms"
  14. 28. The arrangement of electrons in an atom is called the electron ________________.
Down
  1. 1. Protons have a __________ charge
  2. 4. Scientist that discovered the neutron.
  3. 5. Atom of the same element with different number of neutrons.
  4. 6. Atom that has gained or lost electrons.
  5. 8. Discovered electrons.
  6. 9. Electrons have a __________ charge
  7. 10. Early people believed in only _________ elements.
  8. 12. Dalton's atomic theory was better accepted because he based it on ____________.
  9. 13. Rutherford used the ______________ experiment to discover the nucleus.
  10. 14. Small dense positive center of an atom.
  11. 16. English teacher that came up with the first Atomic Theory.
  12. 17. Scientist that discovered the atom is mostly empty space.
  13. 19. All atom are ____________ , meaning the same number of positives and negatives.
  14. 24. The modern model of the atom is called the _________ ______ model.
  15. 25. Relative mass of subatomic particles is measured in ____.
  16. 26. Equals the number of protons in an atom.