Electron
Configuration
    3.3
Models
• 1st model of the atom
  – Rutherford “plum pudding”
• Next model
  – Bohr, 2 years later
  – Introduced the idea ...
Present Model
• Orbitals are like clouds.
  – Show areas where electrons are likely to be
    found.
     • Like the prope...
Light is a Wave…
• Light travels in waves.
     • 2.998 x 108 m/s
• ROYGBIV
• Different colors have different energies.
  ...
Light is a particle?
• Einstein said light is a particle.
  – Observed the photoelectric effect.
     • When light strikes...
Light Emission
• When energy is absorbed, electrons move
  from a low to a higher energy level.
                      BUT
...
State
• Ground State
  – State of lowest possible energy
  – Where e- normally are
• Excited State
  – Where e- moves when...
Energy Levels
• s
      – Can contain only 2 e-
• p
      – Can contain 6 e-
• d
      – Can contain 10 e-
• f
      – Can...
Aufbau Principle
• The aufbau (German for “building up”)
  principle tells us the order to follow when
  writing energy le...
Aufbau Principle
1s2
2s2 2p6
3s2 3p6 3d10
4s2 4p6 4d10 4f14
5s2 5p6 5d10 5f14
6s2 6p6 6d10 6f14
7s2 7p6 7d10 7f14
Practice
Write electron orbital configurations for the elements
 below:
     5 e-
     27 e-
     18 e-
     19 e-
     23...
Answers
B 1s22s22p1

Co 1s 22s22p63s23p64s23d7

Ar 1s22s22p63s23p6

K 1s22s22p63s23p64s1

V 1s22s22p63s23p64s23d3
Electrons & the Periodic Table
• The periodic table is arranged by increasing
  atomic number (# of p+).
• Each element is...
Examples
• Oxygen 1s22s22p4
  can be written as [He] 2s22p4

• Br 1s22s22p63s23p64s23d104p5
  can be written as [Ar] 4s23d...
Homework
 Page 99
1,2,4,5,6,7
1s2

2s 2
       2p6

3s 2
       3p 6
              3d10

4s 2
       4p 6
              4d 10
                      4f14...
3.3 electron configuration
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  • 3.3 electron configuration

    1. 1. Electron Configuration 3.3
    2. 2. Models • 1st model of the atom – Rutherford “plum pudding” • Next model – Bohr, 2 years later – Introduced the idea of energy levels • The difference between 2 energy levels is a quantum of energy.
    3. 3. Present Model • Orbitals are like clouds. – Show areas where electrons are likely to be found. • Like the propellers on an airplane or helicopter.
    4. 4. Light is a Wave… • Light travels in waves. • 2.998 x 108 m/s • ROYGBIV • Different colors have different energies. – Blue end is more energetic than the red end of the spectrum.
    5. 5. Light is a particle? • Einstein said light is a particle. – Observed the photoelectric effect. • When light strikes metal, electrons are released. – This only happens at certain frequencies.
    6. 6. Light Emission • When energy is absorbed, electrons move from a low to a higher energy level. BUT • They cannot maintain the higher state and fall back. – When this happens they release the energy they absorbed. • Produces light.
    7. 7. State • Ground State – State of lowest possible energy – Where e- normally are • Excited State – Where e- moves when energy is absorbed – Can’t stay…Emit light & fall back to ground state
    8. 8. Energy Levels • s – Can contain only 2 e- • p – Can contain 6 e- • d – Can contain 10 e- • f – Can contain 14 e-
    9. 9. Aufbau Principle • The aufbau (German for “building up”) principle tells us the order to follow when writing energy levels and the e- they contain. • The next slide is extremely important.
    10. 10. Aufbau Principle 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 6f14 7s2 7p6 7d10 7f14
    11. 11. Practice Write electron orbital configurations for the elements below: 5 e- 27 e- 18 e- 19 e- 23 e-
    12. 12. Answers B 1s22s22p1 Co 1s 22s22p63s23p64s23d7 Ar 1s22s22p63s23p6 K 1s22s22p63s23p64s1 V 1s22s22p63s23p64s23d3
    13. 13. Electrons & the Periodic Table • The periodic table is arranged by increasing atomic number (# of p+). • Each element is 1 proton and electron higher than the one before it. • It is an acceptable shortcut to write the electron configuration for larger elements by noting the symbol of the noble gas on the previous line before it followed by the remaining orbitals. • ???
    14. 14. Examples • Oxygen 1s22s22p4 can be written as [He] 2s22p4 • Br 1s22s22p63s23p64s23d104p5 can be written as [Ar] 4s23d104p5
    15. 15. Homework Page 99 1,2,4,5,6,7
    16. 16. 1s2 2s 2 2p6 3s 2 3p 6 3d10 4s 2 4p 6 4d 10 4f14 5s 2 5p 6 5d 10 5f 14 6s 2 6p 6 6d 10 6f 14 7s 2 7p 6 7d 10 7f 14

    ×