09-04-Lecture

09-04-Lecture - ATOMIC STRUCTURE& BONDING ➜ atomic...

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Unformatted text preview: ATOMIC STRUCTURE & BONDING ➜ atomic structure ➜ atomic bonding & material properties 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 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 # 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 5 Periodic Table - Metals/Non-metals 6 Periodic Table - Electronic Greed Electro-Negative (acceptors) Electro-Positive (donors) 7...
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This note was uploaded on 03/26/2008 for the course ENGR 213 taught by Professor Dr.stubbs during the Fall '04 term at Texas A&M.

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09-04-Lecture - ATOMIC STRUCTURE& BONDING ➜ atomic...

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