Chapter7_1 - CHEMISTRY 1307 Chapter VII The Structure of Atoms and Periodic Trends 1 Arrangement of Electrons in Atoms Electrons in atoms are

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10/11/2011 1 1 CHEMISTRY 1307 Chapter VII The Structure of Atoms and Periodic Trends 2 Arrangement of Electrons in Atoms Electrons in atoms are arranged as SHELLS (n) SUBSHELLS ( l ) __________ (m l ) SPIN (m s ) 3 Arrangement of Electrons in Atoms Shell 1 (n = 1) – one s orbital (l = 0) Shell 2 (n = 2) – one s orbital (l = 0) and three p orbitals (l = 1, m l = -1, 0, 1) Shell 3 (n = 3) – one s orbital (l = 0) three p orbitals (l = 1, m l = -1, 0, 1) and five d orbitals (l = 2, m l = -2, -1, 0, 1, 2) etc. And always, m s = ± 1/2
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10/11/2011 2 4 Electron Occupancy in Sublevels The maximum number of electrons in each of the energy sublevels depends on the sublevel: The s sublevel holds a maximum of __ electrons. The p sublevel holds a maximum of __ electrons. The d sublevel holds a maximum of __ electrons. The f sublevel holds a maximum of __ electrons. The maximum electrons per level is obtained by adding the maximum number of electrons in each sublevel. 5 Electrons in Atoms When n = 1, then l = 0 This shell has a single orbital (1s) to which 2 electrons can be assigned. When n = 2, then l = 0, 1 2s orbital 2 electrons three 2p orbitals 6 electrons TOTAL = 8 electrons 6 Electrons in Shells The number of subshells _________ with the shell value (n). Therefore each higher shell holds more electrons. (more orbitals)
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10/11/2011 3 7 Assigning Electrons to Subshells In the H-atom, all subshells of same n have same energy. In a multi-electron atom: 1. subshells increase in energy as value of n + l increases. 2. for subshells of same n +
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Chapter7_1 - CHEMISTRY 1307 Chapter VII The Structure of Atoms and Periodic Trends 1 Arrangement of Electrons in Atoms Electrons in atoms are

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