311C F09 L3OL - The Chemical Context of Life Matter Element...

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Unformatted text preview: The Chemical Context of Life Matter Element Organisms are composed of matter Periodic Table of the Elements Essential elements Atoms Composed of subatomic particles Atomic models Atoms Atomic Number Mass Number Isotopes Electron distribution Electron shells (energy levels) Fig. 2-8 (a) A ball bouncing down a flight of stairs provides an analogy for energy levels of electrons Third shell (highest energy level) Second shell (higher energy level) Energy absorbed First shell (lowest energy level) Atomic nucleus (b) Energy lost Fig. 2-9 Hydrogen 1 H Lithium 3 Li Beryllium 4 Be Boron 5 B Carbon 6 C Nitrogen 7 N Oxygen 8 O Fluorine 9 F Neon 10 Ne Helium 2 He Atomic number Element symbol Electron- distribution diagram Atomic mass 2 He 4.00 First shell Second shell Third shell Sodium 11 Na Magnesium 12 Mg Aluminum 13 Al Silicon 14 Si Phosphorus 15 P Sulfur 16 S Chlorine 17 Cl Argon 18 Ar Electron distribution determines behavior of an atom Valence electrons Chemical Bonds Covalent bonds Ionic bonds Hydrogen bonds Van der Waals interactions Covalent Bonds Molecule Covalent Bond 1 H 1 H Fig. 2-12Fig....
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This note was uploaded on 11/01/2009 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas at Austin.

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311C F09 L3OL - The Chemical Context of Life Matter Element...

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