1
Exam 1 practice questions:
1.
Write the ground state electron configuration for each of the following species.
Use the noble gas core symbol
to abbreviate the inner core of electrons and give the electron configuration beyond the noble gas core.
Assume
the normal filling rules are obeyed
.
Electron Configuration
number of unpaired electrons
(a)
Sn
___________________________
___________
(b)
Sn
4+
___________________________
___________
(c)
Er
3+
___________________________
___________
(d)
V
+
___________________________
___________
(e)
Ir
___________________________
___________
2.
(a)
Fill in the blanks in the table below.
Mark the angular nodes (if any) on your angular wavefunction and
the radial nodes on your radial wavefunction.
Explain how you arrived at your orbital choice.
Overall wavefunction
Radial wavefunction (R(r)
n, l
)
,
mark radial
nodes with an x
Angular wavefunction (Y
l, m
);
show
angular node(s)
R(r)
r
(b)
How many radial nodes does the plot of the overall wavefunction show? ___________
(c)
How many angular nodes does the plot of the overall wavefunction show? ___________
(d)
Which orbital does the above overall wavefunction correspond to?
Give the
n
and
l
values and the letter
designation for the orbital.
3.
On the same coordinate axes below, sketch approximate representations of the radial density distribution
function (R(r)
2
r
2
)
for H and He
+
.
Give a brief explanation of the relative positioning of H and He
+
.
R(r)
2
r
2
r

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