chemistry

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Across
  1. 4. a complex entity made of many parts
  2. 5. relating to the simplest units of an element or compound
  3. 6. an electrical force linking atoms
  4. 8. a whole formed by a union of two or more elements or parts
  5. 12. an arrangement of points in a regular periodic pattern
  6. 15. occurring or formed with the release of heat
  7. 16. a unit of electrical energy
  8. 17. containing or involving electrically charged particles.
  9. 18. a connection that fastens things together
  10. 19. an arrangement of parts or elements
  11. 20. a stable particle with positive charge
  12. 21. forceful exertion
  13. 23. occurring or formed with absorption of heat
  14. 25. a relation between two opposite attributes
Down
  1. 1. the simplest structural unit of an element or compound
  2. 2. the smallest component of an element
  3. 3. the force by which one object attracts another
  4. 7. a particle that is electrically charged positive or negative
  5. 9. the molecular weight of a substance in grams
  6. 10. the process of ionizing
  7. 11. arrangement of chemical elements according to atomic number
  8. 13. participating in processes changing substances into others
  9. 14. the act of fastening firmly together
  10. 22. an elementary particle with negative charge
  11. 24. of or relating to a molecule made up of two atoms