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CHEM 152A – Autumn 2010
Review of material covered since Exam 2
Chapter 12 – Quantum Mechanics and Atomic Theory
Section 12.10 – Electron Spin and the Pauli Principle

Define the fourth quantum number, electron spin quantum number (m
s
) and know the allowed
values for m
s

Be familiar with the Pauli exclusion principle
Section 12.11 – Polyelectronic Atoms

Understand how the quantum mechanical model is expanded to include polyelectronic atoms

Be familiar with the concept of effective nuclear charge
Section 12.13 – The Aufbau Principle and the Periodic Table

Understand how to apply the aufbau principle to show how the electrons are arranged in the
atomic orbitals of various atoms

Be able to draw an orbital diagram and fill it in appropriately for the given atom or ion

Understand and be able to apply Hund’s rule when filling in atomic orbitals

Be able to write shorthand notation for electron configurations

Know the difference between core and valence electrons

Be familiar with the patterns in electron configurations for the same group of elements

Know the electron configurations for Cr and Cu

Know the order in which the atomic orbitals are filled for all periods and rows in the periodic
table

Know the names of the different regions of the periodic table

Extra Exercises:
12.63, 12.67, 12.69, 12.71, 12.73, 12.77, 12.79
Section 12.14 – Further Development of the Polyelectronic Model

Be familiar with the concepts of the penetration effect and electron shielding
Section 12.15 – Periodic Trends in Atomic Properties
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 Spring '11
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 Electron

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