Chemistry in Biology

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