Biology

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Across
  1. 2. The attractive force between 2 ions of opposite charge
  2. 4. Any substance that forms hydroxide ions in water
  3. 5. The first energy level holds how many electrons?
  4. 8. Where negatively charged particles are held
  5. 10. substance that can't be broken down into simpler substances
  6. 11. Group of atoms held together by a covalent bond
  7. 12. Forms a code for life
  8. 13. Example of a compound
  9. 15. The center of an atom
Down
  1. 1. Any substance that forms hydrogen ions in water
  2. 3. Composed of carbon, hydrogen, and oxygen
  3. 6. Sub units are amino acids
  4. 7. Chemical reactions that occur inside an organism
  5. 9. holds two hydrogen atoms together
  6. 14. Main function is long term energy storage