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Chapter 6
Electronic Structure
and
the Periodic Table
c= λf
•λ = c/f
•f = c/λ
c = speed of light, 2.998 x 108m/s
λ = wavelength, m
f = frequency, Hertz, Hz
Problem
Microwaves have a wavelength of 1.000 cm. Calculate their
frequency in Hz.
1.000 cm = 1.000 x 10-2m
f = (2.998 x 108m/s)/1.000 x 10-2m = 2.998 x 1010Hz
Problem
Calculate the wavelength of a band on your AM radio with a
frequency of 4.56 x 105Hz.
λ = (2.998 x 108m/s)/(4.56 x 105Hz) = 657 m
Wave
Energy
E = hc/λ
E = hf
E = energy, Joules, J
c = speed of sound, 2.998 x 108m/s
h = Planck’s constant, 6.626 x 10-34J*s
Problem
Calculate the the energy of microwaves in Joules,
using the frequency 2.998 x 1010Hz.
E = hf
E = (6.626 x 10-34J*s)(2.998 x 1010Hz) = 1.986 x 10-23J
Problem
Calculate the energy in Joules of an AM radio
wave having a wavelength of 657 m.
E = hc/λ
E = (6.626 x 10-34J*s)(2.998 x 108m/s)/657 m =
3.0 x 10-28J
Quantum Numbers
Principle Quantum Number
 Symbolized by n
 Indicates the main energy level occupied by
the electron
 Values are integers starting with 1
Angular Momentum Quantum Number
 Symbolized by l
 Indicates shape
 Values are 0, 1, 2, 3
s
p
d
f
0
1
2
3
Magnetic Quantum Number
Symbolized by ml
Indicates the orientation of the orbital around
the nucleus
Values are l,…, +1, 0, -1, ..., -l
Spin Quantum Number
 Symbolized by ms
 Indicates the fundamental spin states of an
electron in an orbital
 Values are + ½ and -1/2
Review
Electron Configurations
Orbital Diagrams
Noble Gas Configurations
Periodic trends
Atomic Radius
Ionization Energy
Electronegativty
Periodic Trends
Atomic Radius
Decreases across periodic table from left to right
Increases down a group
Ionization Energy
Increases across periodic table from left to right
Decreases down a group
 Electronegativity
Increases across periodic table from left to right
Decreases down a group
Ionic Radius
Ionic Radii increase down a group.
Cations are smaller than their corresponding atoms.
Anions are larger than their corresponding atoms.
Chapter 6 Assignment
Summary problem page 158
Chapter Review p. 159
2, 5, 10, 30, 32, 34, 34, 38, 40