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Unformatted text preview: f Life (Chapter 2) 3/29/08 The radioactive (ie. unstable) isotopes used most frequently as "tracers" in biology are: 3H ("tritium") 14C 32P and 33P 35S 2.2 How do Atoms bond to Form Molecules? Covalent Bond (IMPORTANT) Hydrogen Bond (IMPORTANT) Ionic Bond "Hydrophobic Interactions" van der Waals Forces p. 25 Summary of Chemical Bonding Forces: Example: H + H ---> H:H = H-H = H2 = "molecular hydrogen" The bond between the 2 Hydrogen atoms, represented by the "-" in H-H is a (non-polar) covalent bond, NOT a Hydrogen Bond! The chemical elements are assigned electronegativity values from 0.0 to 4.0 that approximately reflect "their power of attraction for the electrons in a coval...
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- Fall '07