Chemistry in Biology

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