17 Nov 2018

Quantum Numbers and Nodes

In-Class Activity

Submitted by Jack F Eichler, University of California, Riverside
Course Level: 

This is a flipped classroom module that covers the concepts of quantum numbers, and radial and angular nodes. This activity is designed to be done at the beginning of the typical first quarter/first semester general chemistry course (for an atoms first approach; if instructors use a traditional course structure this unit is likely done towards the middle/end of the first quarter/semester). Students will be expected to have learned the following concepts prior to completing this activity:

a) quantization of energy in the atom and the Bohr model of the atom;

b) how the wave/particle duality of electrons was described by de Broglie;

c) how the wave/particle duality of electrons was used by Schrodinger to develop the quantum mechanical model of the atom;

d) how radial probability distribution was used to generate the idea of atomic orbitals, and orbital probability surfaces.


Learning Goals: 

a) describe the meaning of the quantum numbers n, l, and ml;

b) determine the values of the quantum numbers n, l, and ml;

c) describe the meaning of radial and angular nodes;

d) determine the number of radial and angular nodes on different types of atomic orbitals;

e) begin to understand the correlation between the quantum numbers and the total number of atomic orbitals for a given atom, and how the periodic table can be used to build up the overall orbital structure for an atom.


Equipment needs: 

Suggested technology:

1) online test/quiz function in course management system

2) in-class response system (clickers)

Implementation Notes: 

Attached as separate file. 

Time Required: 
50-80 minutes
Evaluation Methods: 
1) Performance on the pre-lecture online quiz

2) Performance on the in-class activity (clicker scores or hand-graded worksheet)




Evaluation Results: 

Students generally score on average 70% or higher on the pre-lecdure quiz, and on average 70% or more of students correctly answer the in-class clicker questions. 

Creative Commons License: 
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