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ELECTRON CONFIGURATION

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ELECTRON CONFIGURATION The arrangement of electrons in an atom Each element has a distinct electron configuration Electron configuration describes the relationship ... – PowerPoint PPT presentation

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Title: ELECTRON CONFIGURATION


1
ELECTRON CONFIGURATION
  • The arrangement of electrons in an atom
  • Each element has a distinct electron
    configuration
  • Electron configuration describes the relationship
    between energy and stability

2
ELECTRON CONFIGURATION
  • Electrons and nucleus interact to make the most
    stable arrangement possible (lowest energy)
  • The lowest arrangement is the
  • ground-state electron configuration

3
ELECTRON CONFIGURATION
  • There are three rules for electron configurations
  • Aufbau principle
  • Pauli exclusion principle
  • Hunds rule

4
ELECTRON CONFIGURATION
  • AUFBAU PRINCIPLE
  • Electrons occupy the orbitals of lowest energy
    first

5
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6
ELECTRON CONFIGURATION
  • Aufbau order filling

7
ELECTRON CONFIGURATION
  • Pauli exclusion principle
  • One orbital may describe at most 2 electrons
  • To occupy the same orbital, the two electrons
    must have opposite spins

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8
ELECTRON CONFIGURATION
  • Hunds rule
  • When filling orbitals of equal energy,
  • One electron occupies each orbital

9
ELECTRON CONFIGURATION
  • HUNDS RULE cont.
  • Until all orbitals contain one electron with the
    same spin direction
  • Then they can be paired

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10
ELECTRON CONFIGURATION
  • Exceptions
  • Half-filled sublevels are less stable than filled
    sublevels but more stable than other
    configurations

11
ELECTRON ARRANGEMENT
  • Orbital notation
  • Electron configuration notation
  • Noble gas configuration

12
ORBITAL NOTATION
  • Beryllium
  • Nitrogen

13
ORBITAL NOTATION
  • Fluorine
  • Phosphorous

14
ELECTRON CONFIGURATION NOTATION
  • Contains only the sublevel notation and
  • Superscripts to indicate the number of electrons
    in the sublevel

15
ELECTRON CONFIGURATION NOTATION
  • 1s2 2s2 2p1
  • has a total of 5 electrons (2215)
  • In ground state 5 protons
  • Atomic number 5
  • Boron

16
ELECTRON CONFIGURATION NOTATION
  • 1s2 2s2 2p6
  • 1s2 2s2 2p6 3s1
  • 1s2 2s2 2p6 3s2 3p6 4s2 3d10

17
NOBLE GAS CONFIGURATION
  • Find the noble gas (group 18) before the element
    you are arranging
  • Write that noble gas configuration as symbol
  • He, Ne, Ar
  • Then continue to write the electron configuration
    from that point

18
NOBLE GAS CONFIGURATION
  • Practice
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