Transcript Electron Configurations - University of California, Irvine

Electron Configurations
SHIELDING AND PENETRATION
• ORBITALS WITH RADIAL PROBABILITY CLOSER TO THE
NUCLEUS ARE MORE PENETRATING.
• THE CLOSER, MORE PENETRATING ORBITALS, ARE
SHIELDING THE FURTHER ORBITALS FROM THE
NUCLEUS.
ENERGIES OF ORBITALS
Everything other than Hydrogen
Hydrogenei
E
Questions:
What is the difference between the two?
Why do you think hydrogen is different?
ENERGIES OF ORBITALS
Everything other than Hydrogen
Hydrogenei
E
Question: Here I have draw hydrogen with atomic orbitals higher than 1. Is this
correct? Why or why not?
ENERGIES IN RELATION TO PERIODIC TABLE
1s
2p
3d
4f
http://www.docstoc.com
Find the electron configuration of: Oxygen
1s22s22p4 OR [He] 2s22p4
What ion do you think oxygen likes to be?
-2 ion
Why? Give the electron configuration of the ion in
your explanation.
1s22s22p6 OR [He] 2s22p6 OR [Ne]
1s
3d
4f
2p
What is the electron Configuration for selenium
More than one answer may be
possible
• A) [Ar]4s23d104p4
• B) [Ar]4s24p4
• C) [Ar]4s24d104p4
• D) [Ar]4s23d103p4
• E) None of the above
What is the electron Configuration for the fluorine ion?
More than one answer may be
possible
• A) [He]2s22p5
• B) [He]2s22p6
• C) [He]
• D) [Ne]2s22p6
• E) [Ne]
ELECTRON CONFIGURATIONS: EXCEPTIONS
• Half filled and full filled orbitals are more stable. To get d orbitals to this stability promote electrons from s orbitals.
ONLY ONE
• Fs also have a bunch of exceptions, don’t worry about these. If I ask for an electron configuration from the F block,
just follow the rules
• Question: Why can we be so fluid with our exchange of electrons from the s and d orbitals?
• Energy levels are very close to each other!
Is this actually important?
(cough cough will you test us on this?)
Absopositivilutely
I promise to put some exceptions (likely at least two) on the exam
that you have to give me the electron configuration for.
What is the electron Configuration for neutral chromium
More than one answer may be
possible
• A) [Ar]4s23d4
• B) [Ar]4s14p5
• C) [Ar]4s04d5
• D) [Ar]4s13d5
• E) None of the above.
What is the electron Configuration for zinc
More than one answer may be
possible
• A) [Ar]4s23d10
• B) [Ar]4s04p10
• C) [Ar]4s24d8
• D) [Ar]4s13d9
ELECTRON CONFIGURATIONS: EXCEPTIONS
• When valence d orbitals have electrons and you need to make an
positive ion, remove from valence s orbitals first.
What is the electron Configuration for Co2+
• A) [Ar]4s23d5
• B) [Ar]4s04p7
• C) [Ar]4s14d6
• D) [Ar]4s23d7