Atoms and the Periodic Table

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Across
  1. 5. Atoms to the right of the Periodic Table; usually lose electrons
  2. 8. number of protons + neutrons in an atom
  3. 11. Atoms become more stable when they fill their outermost shell, usually with 8 electrons. This is called the .... rule
  4. 12. the Periodic Table is arranged according to this
  5. 13. has most of the mass of the atom
  6. 14. subatomic particle with positive charge and mass of 1
Down
  1. 1. an ion with more electrons than protons
  2. 2. another name for the outermost shell
  3. 3. Most atoms in the table; usually form cations
  4. 4. an ion with positive charge
  5. 6. row in the Periodic Table. Elements here share the same number of shells.
  6. 7. column in the Periodic Table. Elements here share similar chemical and physical properties.
  7. 9. electrons are arranged in...
  8. 10. subatomic particle with negative charge and 0 mass