Matter

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Across
  1. 1. the smallest particle of a chemical element
  2. 3. the least amount possible
  3. 5. a span of time or a timeframe
  4. 10. not metal
  5. 12. a thing that represents something else
  6. 14. the information center of the cell
  7. 15. a group of atoms bonded together
  8. 16. power derived from the use of resources
  9. 18. the spreading of somethin more widely
Down
  1. 2. a solid material good with electrical conductivity
  2. 4. a stable subatomic particle
  3. 6. another name for nucleon number
  4. 7. the process of unconscious thought
  5. 8. number of chemical elements
  6. 9. an admixture of metals
  7. 11. any element in group VIIA of the periodic table
  8. 13. an essential part of something
  9. 15. anything that occupies space
  10. 17. a number of things located together