Chemistry of life

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Across
  1. 5. is a noble gas
  2. 8. there are 118 of these
  3. 9. is the smallest unit of matter
  4. 11. has the atomic mass of 32.066
  5. 12. gives an atom its characteristics
  6. 15. is when an atom loses an electron
  7. 16. the particles that make up an atom
  8. 17. has no charge but has a mass of 1amu
  9. 18. 54 protons
  10. 19. an atom that is most likely to get rid of an electron, 1st on column on the PT
  11. 21. has only 1 proton
Down
  1. 1. low persentages of these elements are in living things
  2. 2. is when an atom gains an electron
  3. 3. has a negative charge
  4. 4. the center of and atom
  5. 6. atoms with the same number of electrons and protons
  6. 7. element with 6 protons
  7. 10. ions play an important role in _________ for organisms
  8. 13. holds a maximum of 2 electrons
  9. 14. breaking apart an atom
  10. 20. has the atomic symbol I