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09-04-Lecture - ATOMIC STRUCTURE BONDING atomic structure...

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ATOMIC STRUCTURE & BONDING atomic structure atomic bonding & material properties
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ATOMIC COMPONENTS Atoms consist of Nucleus = protons + neutrons + …. Electrons Each element has Atomic number (Z) - # of protons Same as # of electrons Atomic weight (A) No of protons + neutrons Varies with isotope
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3 Electron States Atomic behavior depends on electrons Each electron has unique set of quantum #’s n = principal quantum # (shell) Denoted 1, 2, 3, … etc l = angular momentum quantum # (subshell) Denoted s, p, d, or f m = magnetic quantum # (allowable energies) m s = electron spin quantum #
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4 Electron Arrangements fill lowest energy states first 2 electrons per state opposite spins valence electrons in outermost shell participate in bonding & determine properties Outer shell filled valence shell -- inert gases Vacancies -- interact with electrons of other atoms periodic table is based on electron configuration
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5 Periodic Table - Metals/Non-metals
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6 Periodic Table - Electronic Greed Electro- Negative (acceptors) Electro- Positive (donors)
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