Chemistry in Biology

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