Biology Vocabulary

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Across
  1. 5. what does the dissolving
  2. 6. number of protons and neutrons together, indicated below the symbol
  3. 9. a mixture in which one substance is dissolved in water
  4. 11. measurement system to determine the amount of hydrogen ions in a solution
  5. 13. electrons in the outer most orbit of the nucleus
  6. 14. atoms combined chemically through bonding
  7. 17. neutral particle
  8. 18. what is dissolved
  9. 19. an atom with increased number of neutrons
Down
  1. 1. a short representation
  2. 2. a protein that acts a catalyst in living cells
  3. 3. two or more substance mixed together physically
  4. 4. basic unit of life
  5. 5. solution in which the materials does dissolve but breaks into tiny particles that float within
  6. 7. number of protons, indicated above the symbol
  7. 8. negatively charged particle
  8. 10. attraction of molecules of different substances
  9. 12. pure substance, one type of atom
  10. 15. center of the atom
  11. 16. positively charged particle