Atoms and the Periodic Table

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Across
  1. 4. Distance from the nucleus to the outermost electron shell (12)
  2. 5. Positively charged particle in an atom's nucleus (6)
  3. 6. Electrons in the outermost shell, important for bonding (15)
  4. 11. Row in the periodic table (6)
  5. 12. Energy needed to remove an electron (15)
Down
  1. 1. Tendency of an atom to attract electrons (15)
  2. 2. Column in the periodic table (5)
  3. 3. Atom with a negative charge (5)
  4. 7. Arrangement of electrons within an atom's orbitals (11)
  5. 8. Neutral particle in the nucleus (7)
  6. 9. Negatively charged particle (8)
  7. 10. Atom with a positive charge (6)