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Lecture 25 - Periodic Trends - Lec 25 Lec-25 Periodic...

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Lec-25: Periodic Trends Lec 25: Periodic Trends Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 1 Electron Configurations Electrons enter and fill orbitals according to four rules: Pauli Exclusion Principle Orbitals can contain a maximum of two electrons which must be of opposite spin. Aufbau or Build-up Principle Electrons enter and fill lower energy orbitals before higher energy orbitals. Hund's Rule electrons will enter the orbitals one- at-a-time to maximize degeneracy Madelung's Rule Orbitals fill with electrons as n + l Electrons can not have the same four Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 2 quantum numbers Oct 28, 2011
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Electron Configurations Electron configurations are reflected in the layout of the periodic table Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 3 The electron configuration for Ca is ? Ca Ca [Ar Ar]4s ]4s 2 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 4
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Periodic Table Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 5 Periodic Table Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 6 Periodic properties reflect electronic structure
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Periodic Trends ` The size of an atom influences both physical and chemical properties. Note that the outer boundary of an atom is not well Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 7 Note that the outer boundary of an atom is not well defined
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