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CHEM1115_Unit 6C - Orbital Diagrams and Electron...

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1 Orbital Diagrams and Electron Configuration Drawing orbital diagrams gives information not only about the orbitals that are/have been filled but also about the number of unpaired electrons. Orbital diagrams can be cumbersome!!
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2 Electron Configuration A short-hand notation is commonly used in place of orbital diagrams to describe the electron configuration of an atom. Electron configuration: a particular arrangement of electrons in the orbitals of an atom
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3 Electron Configuration The electron configuration tells the number of electrons found in each subshell. If there are three electrons in a 2p subshell, we would write: 2p 3 where the superscript (3) indicates the number of electrons in that subshell
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4 Electron Configuration The orbital diagram for an O atom: 1s 2s 2p 3s The electron configuration for an O atom: 1s 2 2s 2 2p 4
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5 Electron Configuration To determine the electron configuration of an atom (or ion) without first writing the orbital diagram: determine the number of electrons present add electrons to each subshell in the correct filling order until all electrons have been added use the “diagonal” diagram to help determine the filling order
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6 Electron Configuration Example: Write the electron configuration of a Mn atom (Z = 25). 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 5
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7 Electron Configuration Example: Write the electron configuration of an O 2- ion (Z = 8). 1s 2 2s 2 2p 6 An O 2- ion has 8 protons and 10 electrons
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8 Electron Configuration Write the electron configuration of a krypton atom (Z = 36). 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 This is the Kr “core” [Kr] The noble gas “core” can be used to write the electron configuration of an element using core notation: noble gas “core” + valence electrons
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9 Core notation To write the electron configuration using the core notation: Find the Noble Gas that comes before the atom.
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