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Quantum Mechanical Model
Chapter 5 Section 2
Quantum Mechanical Model

The model of the atom that treats electrons as waves

Like Bohr the quantum model limits an electron to certain
energy levels

Unlike Bohr’s model it makes no attempt to describe an
electrons path
Vocabulary

Atomic Orbital – the 3D region around the nucleus that the
wave function predicts

Principal quantum number (n) – indicates the relative size
and energy of atomic orbitals

Principal energy level – energy levels indicated by the
principal quantum levels

Energy sublevels – sublevels in principal energy levels
Atomic Orbitals

Orbital shapes

Orbitals increase
in size as principal
quantum number
increases

s, p, d, and f
Energy Sublevels

The number of energy sublevels increases as the principal
quantum number increases

Designated by s, p, d, and f
Principal
Quantum Number
(n)
Sublevels (types
of orbitals)
present
Number of
Orbitals
Total number of
Orbitals related to
Principal energy
level
1
s
1
1
2
s
p
1
3
4
3
s
p
d
1
3
5
9
4
s
p
d
f
1
3
5
7
16
Review Questions
1.
Draw and Label the parts of a wave.
2.
What is the relationship between wavelength and
frequency?
3.
List the electromagnetic spectrum from lowest frequency
to highest frequency.
4.
What is the frequency and energy of a microwave 0.060 m
in length?
5.
Draw an atom in the ground state and the excited state.
6.
Describe the photoelectric effect.
7.
Describe how an emission spectra is formed.
8.
Compare and Contrast the Bohr Model and the Quantum
Mechanical Model.