Atoms and the Periodic Table Review

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Across
  1. 2. Type of charge neutrons have.
  2. 5. Type of charge electrons have.
  3. 6. There are _____ periods on the PT.
  4. 8. Located in the nucleus.
  5. 10. Periodic Table is broken into metals and _____.
  6. 12. Atoms are mostly made up of _____(two words)
  7. 14. Tye of charge protons have.
  8. 15. Number of families on the Periodic Table
  9. 18. Family that has properties of metals and nonmetals.
  10. 19. Gas group that is very stable and doesn't react much.
  11. 20. Maximum number of electrons allowed on first energy shell.
  12. 21. Small subatomic particle- outside of the nucleus.
Down
  1. 1. Maximum number of electrons allowed on second energy shell.
  2. 3. Number of Protons + Number of Neutrons
  3. 4. An atom that has the same number of protons & electrons
  4. 7. Located in the nucleus.
  5. 9. Abbreviation for element name on the PT
  6. 11. Number of protons an element has on the PT
  7. 13. There are ____ groups on the PT.
  8. 16. The center of the atom.
  9. 17. Group 17 are called the ___________.