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Test_1_Lecture_1_Spivak-1

Test_1_Lecture_1_Spivak-1 - Chemistry 2261 Fall 2010 Dr...

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Chemistry 2261 Fall 2010 Dr. David A. Spivak 735 Choppin Hall Office Hours: TR 3:00-4:30 am or by appointment 578-2868 [email protected] Already in Moodle: Syllabus Lecture Notes (before changes) SI: Britney Haydel
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Things you already know….
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Electronic Structure and Bonding (1.1-1.3) Organic Chemistry is the study of carbon compounds. Carbon is truly unique (more later) Atomic structure (1.1) Atomic number (Z) : number of protons in the nucleus of an atom. Mass number (A) : total number of protons and neutrons in the nucleus of an atom. Isotopes : have the same Z but different mass numbers. Atomic orbitals : region of space around the nucleus where the probability of finding an electron is very high. AOs have characteristic shape, size and energy. Orbitals that have the same energy are degenerate orbitals .
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Electronic Structure and Bonding (1.1-1.3) Electron configuration of atoms (1.2) Rule 1 (aufbau principle) : orbitals are occupied in order of increasing energy (1s<2s<2p<3s<3p<4s<3d….) Rule 2 (Pauli’s exclusion principle): only 2 electrons can occupy an orbital and they must have opposite spin. Rule 3 (Hund’s rule): when there are degenerate orbitals, one electron is added to each with their spins parallel until all are half full. Then a second electron with opposite spin is added to each degenerate orbital.
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