January 10, 2007

January 10, 2007 - Life and Chemistry Small Molecules Atoms...

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January 10, 2007 Life and Chemistry: Small Molecules Atoms – nucleus with protons and neutrons Protons - mass of 1, positive charge Neutrons - no charge, mass of 1 Electron – negative charge, negligible mass, “orbits” nucleus o Held to atom though charge attraction of atom Hydrogen, carbon, nitrogen, phosphorus, sulfur, oxygen- 6 elements make up most life (98%) The periodic Table Atomic number = # of protons Atomic Mass- # of protons + # of neutrons Isotopes- different forms of the same element o Same # of protons o Different # of neutrons Radioisotopes – unstable, give off energy as alpha or beta radiation Electrons o Negative charge o Involved in chemical reactions o Found in orbitals Region of space where an electron is found 90% of the time An orbital can contain 2 electrons maximum Electron Orbitals o 1s - sphere o 2s - sphere o p x – “figure 8” o p y - “figure 8” o p z - “figure 8” Chemical Bonds o Forming molecules o An attractive force that links atoms together
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January 10, 2007 - Life and Chemistry Small Molecules Atoms...

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