Chapter 7:
Completing the Model of the Atom
Practice Test
1.
An electron in an atom emits energy in the form of light when it ________________.
a.
rises to a new energy level
b.
leaves the atom
c.
falls back to a lower energy level
d.
leaves the nucleus
Hint
2.
Atoms of which element have the largest s orbitals?
a.
Rb
b.
H
c.
Fr
d.
Na
Hint
3.
The Heisenberg uncertainty principle states that it is fundamentally impossible to know both the ____________________ of the electron at the same time.
a.
mass and size
b.
mass and position
c.
position and energy
d.
energy and orientation
Hint
4.
What electron configuration describes the outermost energy level of a selenium atom?
a.
4s
2
4d
4
b.
4s
2
4p
4
c.
4s
2
4d
10
4p
4
d.
4s
2
3d
10
Hint
5.
The number of valence electrons in a sulfur atom is __________.
a.
six
b.
four
c.
two
d.
eight
Hint
6.
The most stable arrangement of electrons in an atom's sublevels and orbitals is called its ________________.
a.
electron configuration
b.
electron orientation
c.
shape
d.
electronic arrangement
Hint
7.
When an iron atom loses all its 4s electrons and one 3d electron, its oxidation number is ______.
a.
5+
b.
3+
c.
11+
d.
1+
Hint
8.
A nitrogen atoms that gains electrons to make an octet has an oxidation number of ______.
a.
3+
b.
3-
c.
4-
d.
1-
Hint
9.
1s
2
2s
2
2p
1
is the electron configuration for _________.
a.
fluorine
b.
lithium
c.
hydrogen
d.
boron
Hint
10.
The underlying reason that some periods have eighteen elements is that the combined _______ sublevels may contain 18 electrons.
a.
d and f
b.
p and d
c.
s, p, d, and f
d.
s, p, and d
Hint
11.
The light emitted by the gas in a neon sign is __________.
a.
an electron
b.
an emission spectrum
c.
an incandescent light
d.
a filament
Hint
12.
What element has the electron configuration [Ar]4s
2
3d
3
?
a.
vanadium
b.
nitrogen
c.
arsenic
d.
scandium
Hint
13.
What is the electron configuration of radon?
a.
[Xe]6s
2
6p
6
b.
[Xe]5s
2
5p
6
c.
[Xe]5d
8
d.
[Rn]6s
2
6p
6
Hint
14.
The space in which there is a 95% probability of finding an electron is called __________.
a.
an energy level
b.
an orbital
c.
an electron sphere
d.
an energy sublevel
Hint
15.
These orbitals are aligned along the x, y, and z axes.
a.
p orbitals
b.
f orbitals
c.
s orbitals
d.
d orbitals
Hint
16.
Which spectral line, red, green, violet, or blue, has the greatest energy?
a.
green
b.
blue
c.
violet
d.
red
Hint
17.
What electron configuration describes the outermost energy level of a molybdenum atom?
a.
5s
2
b.
4d
4
c.
5d
4
d.
6p
6
Hint
18.
The third energy level may have ____________ sublevels.
a.
four
b.
two
c.
three
d.
eight
Hint
19.
Which element in period 4 has a Lewis dot diagram containing four dots?
a.
selenium
b.
titanium
c.
krypton
d.
germanium
Hint
20.
How many electrons may be contained in a p sublevel?
a.
ten
b.
eight
c.
six
d.
three
Hint
