Quantum Mechanics (Ch 12)
1. One type of electromagnetic radiation has a
frequency of 200 MHz, another has a
wavelength of 225 nm, and another type has
photons with energy equal to 4.20 x 10-19 J.
Convert each to wavelength (in meters) and
put these in order of increasing energy per
photon.
Quantum Mechanics (Ch 12)
2. The ionization energy of gold is 890.1 kJ/mol
(the amount of energy needed to remove a
mole of electrons from atoms on the surface
of gold metal). What is the maximum
wavelength of light that can remove an
electron from a gold atom?
Quantum Mechanics (Ch 12)
3. It takes 208.4 kJ to remove 1 mole of electrons
from atoms on the surface of rubidium metal.
If rubidium is irradiated with 254 nm light,
what is the maximum kinetic energy the
released electrons can have?
Quantum Mechanics (Ch 12)
4. Calculate the wavelength of light associated
with the following transitions in a hydrogen
atom:
a. n =2  n =3
b. n = 4  n=1
c. removing an e- from the second excited state
Quantum Mechanics (Ch 12)
5. Calculate the ionization energy (in kJ/mol) for
ground state He+
Quantum Mechanics (Ch 12)
6. The figure below represents part of the emission spectrum for a
one-electron ion in the gas phase. All of the lines result from
electronic transitions from excited states to the n = 3 state.
If the wavelength of line B is 142.5 nm, calculate the wavelength
of line A.
Quantum Mechanics (Ch 12)
7. Calculate the deBroglie wavelength of the
following:
a. an electron with a velocity 20 % the speed of
light (me = 9.1 x 10-31 kg)
b. a 10.0 g bullet moving at 800 m/s
Quantum Mechanics (Ch 12)
8. Fill in the table:
Quantum # Name
n
l
ml
ms
Meaning
Possible values
Quantum Mechanics (Ch 12)
9. Which of the following are incorrect? Why?
2s
3f
8p
5f
2d
2p
1d
Quantum Mechanics (Ch 12)
10. How many orbitals can have the following
designation? What about electrons?
a. n = 2
b. 3d
c. n = 4, l = 1, ml = 0
d. 5fxyz
Quantum Mechanics (Ch 12)
11. Write electron configurations for:
a. O
b. Ne
c. Ca
d. Br
e. Cr
f. Cu
g. Cf
Quantum Mechanics (Ch 12)
12. How many unpaired electrons are present in
each of the following?
a. P
b. Mg2+
c. Fe
d. S2e. Al
Quantum Mechanics (Ch 12)
13. Which of the following correspond to an excited
state? If so,write the correct ground state
configuration. Identify the element in each case.
a. 1s22s22p53s1
b. [Ne]3s23p4
c. [Ar]4s13d5
d.[Kr]5s24d85p1
e. [Ar]4s23d104p3