matter

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Across
  1. 6. for of matter in which particles of many kind combine
  2. 7. form of matter in which 2 or more than 2 particles combine chemically
  3. 8. level of hardness of a substance or matter
  4. 10. property showing compressing
  5. 11. building blocks of matter that may or may not exist independent
  6. 12. process or conversion of gas to solid on cooling
Down
  1. 1. an example of molecule in which particles combine chemically in a fixed ratio
  2. 2. directly dependent on force of attraction existing amongst the particles
  3. 3. an example of molecule made up of particles of its own kind
  4. 4. process or conversion of solid to liquid on heating
  5. 5. tendency to flow
  6. 9. the mass per unit volume of a substance