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Ch 6
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Kia
CHEM 177
Kingston
October 18th, 2016
True/False, If false change to make it true
1. The electron configuration for NITROGEN is 1s22s22p3.
False
2. The Pauli exclusion principle states that two electrons canNOT have the same set of
quantum numbers.
False
3. The ground state for a helium atom is 1s2.
False
4. If I know the location of an electron, I will NOT know the speed at which it is traveling.
False
Practice Problems
5. Which of the following represent impossible combinations of n and l? 1p, 4s, 5f, 2d
1p, 2d
6. Sketch the shape and orientation of the following types of orbitals
a. s
c. dx2-y2
b. pz
d. dz
7. A hydrogen atom orbital has n=5 and ml = -2. What are the possible values of l and ms for
this orbital?
l= 4,3,2
ms= +1/2, -1/2
8. For n=4, what are the possible values of l?
0,1,2,3
9. For l=2, what are the possible values of ml?
-2,-1,0,1,2
10. If ml is 2, what are the possible values for l?
2 or higher
11. What is wrong with the following electron configurations for atoms in their ground
states?
a. 1s22s23s1
Skipped p orbital
b. [Ne]2s22p3
Neon is in the second row, should be n=3 or higher
c. [Ne]3s23d5
3d doesn’t start until 4s
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12. For the following table, write which orbital corresponds with the quantum numbers.
(don’t worry about orientation subscripts)
N
l
ml
Orbital
2
1
-1
2p
1
0
0
1s
3
-3
2
Not allowed
3
2
-2
3d
2
0
-1
Not allowed
0
0
0
Not allowed
4
2
1
4d
5
3
0
5f
13. What is the maximum number of electrons that can occupy each of the following
subshells?
a. 3p
6
b. 5d
10
c. 2s
2
d. 4f
14
Challenge Questions
14. The following electron configurations represent excited states. Identify the element and
write its ground-state condensed electron configurations.
a. 1s22s22p43s1
2 2 5
F in 1s 2s 2p
b. [Ar]4s13d104p25p1
Ge in [Ar]4s23d104p2
c. [Kr]5s24d25p1
Nb in [Kr]5s24d3
15. The watt is the derived SI unit of power, the measure of energy per unit time: 1W= 1J/s.
A semiconductor laser in a CD player has an output wavelength of 780 nm and a power
level of 0.10 mW. How many photons strike the CD surface during the playing of a CD
69 minutes in length?
1.6x10^18 photons