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Across
  1. 1. Energy released when ionic solid forms
  2. 5. Metal with variable oxidation states
  3. 7. Mixture of metals
  4. 8. Strong permanent magnetic material
  5. 9. Horizontal row of elements
  6. 12. Repeating patterns in periodic table
  7. 15. Solid without long-range order
  8. 16. Number of atoms touching a central atom
  9. 18. Lacking regular atomic arrangement
  10. 19. Arrangement of atoms in solid
Down
  1. 2. Solid with repeating atomic structure
  2. 3. Substance with all electrons paired
  3. 4. Compound of distinct metal atoms
  4. 6. Substance with unpaired electrons
  5. 10. Vertical column of elements
  6. 11. Compound existing in multiple crystal forms
  7. 13. Size of an ion in a crystal lattice
  8. 14. Predictable property change across a period
  9. 16. Solid with ordered atomic pattern
  10. 17. Different structural form of same element