Ch 6
Supplemental Instruction
Iowa State University / Leader: / Kia
Course: / CHEM 177
Instructor: / Kingston
Date: / 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

  1. s
  1. pz
  1. dx2-y2
  1. 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?

  1. 1s22s23s1

Skipped p orbital

  1. [Ne]2s22p3

Neon is in the second row, should be n=3 or higher

  1. [Ne]3s23d5

3d doesn’t start until 4s

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?

  1. 3p

6

  1. 5d

10

  1. 2s

2

  1. 4f

14

Challenge Questions

14.  The following electron configurations represent excited states. Identify the element and write its ground-state condensed electron configurations.

  1. 1s22s22p43s1

F in 1s22s22p5

  1. [Ar]4s13d104p25p1

Ge in [Ar]4s23d104p2

  1. [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