chapter-08 - CHEM 1331 REVIEW CHAPTER 8 n describes shell n...

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CHEM 1331 REVIEW - CHAPTER 8 n describes shell n and describe subshell Use shell and subshell to set up ENERGY LEVEL DIAGRAM 4p _____ _____ _____ 3d _____ _____ _____ _____ _____ 4s _____ 3p _____ _____ _____ 3s _____ 2p _____ _____ _____ 2s _____ 1s _____ Assign FOURTH QUANTUM NUMBER [s or m s – spin, 1/2 or –1/2] USE THREE RULES TO PUT ELECTRONS IN: AUFBAU electrons want lowest possible orbitals PAULI no more than 2 electrons in each orbital (no two electrons in a given atom can have same set of 4 quantum numbers) HUND if there’s a choice, electrons go in empty orbital before in one with one electron CANNOT VIOLATE PAULI or HUND IF VIOLATE AUFBAU, EXCITED STATE ELECTRON CONFIGURATION Use rules to put in electrons – write as: subshell number of electrons USE PERIODIC TABLE TO REMEMBER ORDER OF ENERGY LEVELS First s is 1s 2 electrons MAX in each s subshell First p is 2p 2 electrons MAX in each p subshell, 2 electrons MAX in each p orbital First d is 3d 10 electrons MAX in each d subshell, 2 electrons MAX in each d orbital First f is 4f
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