Atomic Structure and the Periodic Table

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Across
  1. 2. number the number of protons in the nucleus
  2. 4. the positively charged subatomic particle
  3. 6. an organization of the known elements
  4. 8. the outermost energy level of electrons
  5. 10. the subatomic particle with no charge
  6. 12. families of elements with like properties
  7. 13. the scientist that discovered electron energy levels
  8. 17. Group #1 highly reactive metals
  9. 18. Group #18 the stable gases
Down
  1. 1. an element with a different number of neutrons
  2. 2. the sum of the mass of protons and neutrons
  3. 3. with properties of metals and nonmetals
  4. 4. rows in the table that indicate energy levels
  5. 5. the negatively charged subatomic particle
  6. 7. family of elements used to create lasers
  7. 9. family of elements that are mostly radioactive
  8. 10. the center of the atom
  9. 11. energy levels of electrons
  10. 14. Group #17 that create 'salts'
  11. 15. the father of the modern Periodic Table
  12. 16. an atom with a positive or negative charge