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Inorganic Chemistry - Atomic Structure
Biology 2121 Chapter 2
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Introduction (1). Cells are the basic units of living organisms
Atoms ----- elements --- compounds (molecules) Matter (2). Elements 112 total (92 naturally occuring) 96% of body (C,O,H,N) 20 trace elements (3). Inorganic vs Organic Chemistry
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Atomic Structure (1). What are atoms made of? (2). Properties
Nucleus (protons and neutrons) Energy levels (electrons) (2). Properties Neutrons (0, 1 amu) Proton (+1, 1 amu) Electron (-1, 1/2000 amu) Marieb link
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Elements and the Periodic Chart
(1). Metals and Nonmetals (2). Atomic Number # of Protons in nucleus (3) Mass Number Protons + electrons Mass of a single atom!
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Elements and the Periodic Chart
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Average Atomic Mass and Isotopes
What are isotopes? Same type of atoms with differing numbers of neutrons. Average of all isotopes Average atomic mass number Not all isotopes –equal amounts
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Valance Electrons and Planetary Models
Outer shell electrons Involved in bonding (2). Drawing Planetary Models of atoms Periodic chart (appendix C)
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Valence Shells
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Why are valence electrons important?
Valence electrons are involved in bonding Electrons Transferred from one atom to another Shared between atoms
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