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Electron Configurations

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Electron Configurations Objectives: 3.0 Use the periodic table to identify periodic trends, including atomic radii, ionization energy, electronegativity, and energy ... – PowerPoint PPT presentation

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Title: Electron Configurations


1
Electron Configurations
  • Objectives
  • 3.0 Use the periodic table to identify periodic
    trends, including atomic radii, ionization
    energy, electronegativity, and energy levels.
  • 3.1 Utilizing electron configurations, Lewis dot
    structures, and orbital notations to write
    chemical formulas

2
Ground State Electron Configurations
  • Electron configuration the arrangement of
    electrons in an atom
  • What is ground state?
  • Three rules define how electrons are arranged in
    an atoms orbitals
  • The aufbau principle
  • The Pauli exclusion principle
  • Hunds rule

3
The Aufbau Principle
  • Each electron occupies the lowest energy orbital
    available, according to the aufbau diagram

4
The Pauli Exclusion Principle
  • A maximum of 2 electrons may occupy a single
    atomic orbital, but ONLY if the electrons have
    opposite spins (represented by ? and ?).

5
Hunds Rule
  • Single electrons with the same spin must occupy
    each equal-energy orbital before additional
    electrons with opposite spins can occupy the same
    orbitals (i.e., 1 ? in each 3p orbital BEFORE a ?
    can pair up with a ? in an orbital).

6
Orbital Diagrams and Electron Configuration
Notations
  • These are just 2 different ways to represent an
    atoms electron configuration.

7
Orbital Diagrams
  • Have a box for each of the atoms orbitals.
  • Boxes contain either ? (1 electron), or ?? (full
    orbital), or may be empty.
  • Each box is labeled with the principal quantum
    number and the sublevel associated with the
    orbital.
  • Examples on board

8
Electron Configuration Notation
  • Shorthand to designate all electrons and their
    orbitals
  • Designates principal energy level and sublevel,
    and includes a superscript to show the number of
    electrons in the orbital.
  • Example Carbon 1s22s22p2
  • What is the electron diagram for carbon?
  • Table 5-3, p.137

9
Electron Configuration Notation (cont.)
  • What is the electron configuration notation for
    the following elements?
  • Helium
  • Neon
  • Argon
  • Krypton
  • Xenon
  • Radon
  • What do these elements have in common?

10
Electron Configuration Notation (cont.)
  • Electron configuration notation can be
    abbreviated by noble-gas notation.
  • He 1s2
  • Ne 1s22s22p6
  • So magnesium can be written
  • 1s22s22p63s2 -OR-
  • Ne3s2
  • How would you write phosphorous?
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