Chemistry in Biology

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Across
  1. 3. __________-12 is used to date substances that have once been alive
  2. 4. Part of the atom located on the outside of the nucleus
  3. 7. The study of matter
  4. 10. ____________ bonds occur when electrons are shared
  5. 11. The neutral part of an atom
  6. 16. The building blocks of matter
  7. 17. ____________ = Atoms
  8. 18. A pure substance that cannot be broken down by physical means that contains more than one element
  9. 19. The result of a chemical reaction
Down
  1. 1. A pure substance that cannot be broken down by physical means and found on a table
  2. 2. A compound in which the atoms are held together by covalent bonds.
  3. 5. The beginning portion of a chemical reaction
  4. 6. __________ Isotopes are broken down by radiation when the nucleus of an atom breaks up
  5. 8. Are the process by which atoms or groups of atoms in substances are reorganized into different substances
  6. 9. Neutrons and Protons are located in the __________
  7. 12. The positively charged part of an atom
  8. 13. ________ bonds occur when electrons are transferred
  9. 14. Carbon ____________ happens when nitrogen becomes carbon through beta decay
  10. 15. Atoms of the same element that have the same number of protons and electrons but have a different number of neutrons