Electron Arrangement or Electron Configuration

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Electron Arrangement orElectron Configuration
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Electron Arrangement/Configuration

• modern chemistry changed some of Bohrs ideas
• each energy level is divided into sublevels which
  are called orbitals
• orbitals are s, p, d, f and all have
  various shapes
• Orbital ? the region of high probability of
  finding an electron

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• each orbital can hold only two electrons
• s orbitals are spherical in shape
• ? compare the 1s orbital to the 2s orbital
• p orbitals are dumbbell shaped
• ?specifically, there are 3 p orbitals
  differentiated
• by the labels px, py, pz
• For example,
• 3s2, 3 energy level
• s type of orbital
• 2 number of electrons (in that orbital)

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s and p orbitals
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• Sublevel s is lowest in energy followed by p,
  then d, then f
• s sublevel can hold a maximum of 2 electrons
• p sublevel can hold a maximum of 6 electrons
• d sublevel can hold a maximum of 10 electrons
• f sublevel can hold a maximum of 14 electrons

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• Some energy levels do not have all the sublevels
• 1st energy level s orbital only 1s
• 2nd energy level s p orbitals 2s 2p
• 3rd energy level s, p, d orbitals 3s,
  3p, 3d
• 4th energy level s, p, d, f orbitals 4s,
  4p, 4d, 4f

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• The process of organizing electrons in atoms from
  the orbital with the lowest energy to the orbital
  with the highest energy is called electron
  configuration/arrangement.
• Electrons are not organized or build up in
  order of energy level and sublevels
• i.e. 4s come first then 3d

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• Use the following diagram to help remember the
  order in which orbitals fill
• 7s 7p
• 6s 6p 6d
• 5s 5p 5d 5f
• 4s 4p 4d 4f
• 3s 3p 3d
• 2s 2p
• 1s

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• Examples Write the electron configurations for
  the following
• (always determine the total number of electrons
• involved then use the helpful tool to write out
  each orbital in order of building up)
• H
• O
• K

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Make Note

• The periodic table is divided according to the
  filling order of sublevels
• Can relate a specific sublevel to a part of a row
  in the periodic table
• Creates trends in how elements react

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Periodic Table