Matter and Energy Crossword Puzzle

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Across
  1. 2. Molecules with same atom types but different atom arrangements
  2. 4. When arranged elements show periodic properties
  3. 8. Study of chemistry of living things
  4. 12. Belief that universe formed by gradual process
  5. 13. Layer that arranges electrons
  6. 14. Philosophy that nothing is knowable outside of the world
  7. 17. Most accepted evolutionary view of the universe
  8. 18. Globular proteins that regulate chemical reactions
Down
  1. 1. A huge organic molecule composed of smaller ones
  2. 3. Latin for "out of nothing"
  3. 5. Diagram showing locations of atoms in a compound
  4. 6. Composed of physically mixed substances
  5. 7. Carries a positive charge
  6. 9. Study of carbon compounds
  7. 10. Process which body produces/ueses energy from food
  8. 11. Rule of eight electrons per valence shell
  9. 15. Shows atom arrangement in space
  10. 16. Mixture containing tiny particles