Lacey_Che131_S2012_Lect-25s

Lacey_Che131_S2012_Lect-25s - ec 5 Periodic TrendsLec 25...

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Unformatted text preview: ec- 5: Periodic TrendsLec 25: Periodic TrendsRoy A. Lacey, Stony Brook University; Che 131, Spring 20121Electron ConfigurationsElectrons enter and fill orbitals according to four rules:Pauli Exclusion PrincipleOrbitals can contain a maximum of two electrons which must be of opposite spin.Aufbau or Build-up PrincipleElectrons enter and fill lower energy orbitals before higher energy orbitals. Hund's Ruleelectrons will enter the orbitals one-at-a-time to maximize degeneracyMadelung's RuleOrbitals fill with electrons as n+lElectrons can not have the same four Roy A. Lacey, Stony Brook University; Che 131, Spring 20122quantum numbersElectron ConfigurationsElectron configurations are reflected in the layout of the periodic tableRoy A. Lacey, Stony Brook University; Che 131, Spring 20123The electron configuration for Ca is ?Ca Ca [ArAr]4s]4s21s1s22s2s22p2p63s3s23p3p6 6 4s4s2 2 Roy A. Lacey, Stony Brook University; Che 131, Spring 20124Periodic TableRoy A. Lacey, Stony Brook University; Che 131, Spring 20125Periodic TableRoy A. Lacey, Stony Brook University; Che 131, Spring 20126Periodic properties reflect electronic structurePeriodic Trends`The size of an atom influences both physical and chemical properties....
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Lacey_Che131_S2012_Lect-25s - ec 5 Periodic TrendsLec 25...

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