Chemistry in Biology

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