Chapter 7
Electronic Structure of Atoms
Considering only the n = 1 to n = 5 states
in the hydrogen atom, which transition
will emit the most energy?
1.
2.
3.
4.
5.
n = 5 to n = 4
n = 5 to n = 2
n = 3 to n = 1
n = 3 to n = 2
n = 4 to n = 2
Considering only the n = 1 to n = 5 states
in the hydrogen atom, which transition
will emit the most energy?
1.
2.
3.
4.
5.
n = 5 to n = 4
n = 5 to n = 2
n = 3 to n = 1
n = 3 to n = 2
n = 4 to n = 2
Considering only the n = 1 to n = 5 states
in the hydrogen atom, which transition will
emit the longest wavelength?
1.
2.
3.
4.
5.
n = 5 to n = 4
n = 5 to n = 2
n = 3 to n = 1
n = 3 to n = 2
n = 4 to n = 2
Considering only the n = 1 to n = 5 states
in the hydrogen atom, which transition will
emit the longest wavelength?
1.
2.
3.
4.
5.
n = 5 to n = 4
n = 5 to n = 2
n = 3 to n = 1
n = 3 to n = 2
n = 4 to n = 2
What are the valence electrons of
vanadium?
1.
2.
3.
4.
5.
4s2
3d3
4s2 3d3
3d5
4d5
What are the valence electrons of
vanadium?
1.
2.
3.
4.
5.
4s2
3d3
4s2 3d3
3d5
4d5
What are the valence electrons of
gallium?
1.
2.
3.
4.
5.
4s2
4p1
4s2 3d10 4p1
4s2 3d10
4s2 4p1
What are the valence electrons of
gallium?
1.
2.
3.
4.
5.
4s2
4p1
4s2 3d10 4p1
4s2 3d10
4s2 4p1
What is the maximum number of orbitals
described by the quantum numbers:
n=3
1.
2.
3.
4.
5.
1
3
5
8
9
l=2
What is the maximum number of orbitals
described by the quantum numbers:
n=3
1.
2.
3.
4.
5.
1
3
5
8
9
l=2
What is the maximum number of electrons
described by the quantum numbers:
n=4
1.
2.
3.
4.
5.
7
14
16
32
48
What is the maximum number of electrons
described by the quantum numbers:
n=4
1.
2.
3.
4.
5.
7
14
16
32
48
How many nodal planes does a d
orbital have?
1.
2.
3.
4.
5.
0
1
2
3
4
How many nodal planes does a d
orbital have?
1.
2.
3.
4.
5.
0
1
2
3
4
How many unpaired electrons does
selenium have?
1.
2.
3.
4.
5.
0
2
4
6
8
How many unpaired electrons does
selenium have?
1.
2.
3.
4.
5.
0
2
4
6
8
How many unpaired electrons does
chromium have?
1.
2.
3.
4.
5.
0
2
4
6
8
How many unpaired electrons does
chromium have?
1.
2.
3.
4.
5.
0
2
4
6
8
What is the wavelength for radiation
transmitted by WGR, 550 AM (550
kHz)?
1.
2.
3.
4.
5.
0.545 m
5.45 m
545 m
0.0018 m
1.8 m
Correct Answer:
1.
2.
3.
4.
5.
0.545 m
5.45 m
545 m
0.0018 m
1.8 m
l=
c
n
=
(3.0 
10 ms )
(5.5 
l = 545
-1
8
5
-1
10 s )
Predict which of the following
electronic transitions will produce the
longest wavelength
spectral line.
1.
2.
3.
4.
n = 4 to n = 2
n = 5 to n = 2
n = 5 to n = 3
n = 6 to n = 4
Correct Answer:
1.
2.
3.
4.
n = 4 to n = 2
n = 5 to n = 2
n = 5 to n = 3
n = 6 to n = 4
The wavelength
increases as frequency
decreases. The lowest
frequency (longest
wavelength) is
associated with the
lowest energy, and the
smallest energy
difference here is
between n = 6 and n = 4.
What is the wavelength of a helium-4
ion moving in a cyclotron at 1.0% the
speed of light?
Mass of helium -4 ion = 6.6  10-27 g.
1.
2.
3.
4.
3.3  10-6 m
3.3  10-8 m
3.3  10-11 m
3.3  10-14 m
Correct Answer:
1.
2.
3.
4.
3.3  10-6 m
3.3  10-8 m
3.3  10-11 m
3.3  10-14 m
l=
h
mv
=
(6.63 
(6.6 
10
- 30
10
-34
kg)(3.0 
l = 3.3  10 -11
Js)
6
-1
10 ms )
Which of the following is not an
allowed set of quantum numbers?
1. n = 3, l = 1, ml = 1
2. n = 3, l = 3, ml =-2
3. n = 4, l = 0, ml = 0
4. n = 3, l = 1, ml =-1
Correct Answer:
1. n = 3, l = 1, ml = 1
2. n = 3, l = 3, ml =-2
3. n = 4, l = 0, ml = 0
4. n = 3, l = 1, ml =-1
The value of l can be
no larger than n - 1.
How many electrons maximum can
exist in the 4d orbital?
1.
2.
3.
4.
2
6
10
14
Correct Answer:
1.
2.
3.
4.
2
6
10
14
There are five 4d
orbitals, each of which
can contain up to 2
electrons each for a
total of 10 maximum.
The electron subshell 3p represents the
principal quantum number n = ___ and
azimuthal quantum number l = ___.
1.
2.
3.
4.
3; 2
2; 3
3; 1
1; 3
Correct Answer:
1.
2.
3.
4.
3; 2
2; 3
3; 1
1; 3
The principal quantum
number n is 3, and a p
orbital indicates l = 1.
The maximum number of electrons in
an atom that can exist in the 4f
subshell and have ml = -1 is
1.
2.
3.
4.
2
7
14
32
Correct Answer:
1.
2.
3.
4.
2
7
14
32
For any value of ml,
the maximum number
of electrons is 2.
The following orbital diagram
represents the electron configuration
of which element?
1s
2s
1.
2.
3.
4.
Carbon
Nitrogen
Oxygen
Neon
2p
Correct Answer:
1s
2s
1.
2.
3.
4.
Carbon
Nitrogen
Oxygen
Neon
2p
The element with the electronic
configuration [Ar]4s13d5 is:
1.
2.
3.
4.
Manganese
Chromium
Magnesium
Iron
Correct Answer:
1.
2.
3.
4.
Manganese
Chromium
Magnesium
Iron
What is the characteristic outer shell
electron configuration of the noble
gases?
1.
2.
3.
4.
s2p6
s2p5
s2p4
s2p3
Correct Answer:
1.
2.
3.
4.
s2p6
s2p5
s2p4
s2p3
Noble gases have
completely filled s and
p orbitals, hence their
lack of reactivity.
Which of the following orbital
diagrams obeys Hund’s rule for a
ground-state atom?
1.
2.
3.
3s
3d
3s
3d
3s
3d
Correct Answer:
1.
2.
3.
3s
3d
3s
3
d
3s
3d