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WorksheetsElectrons in Atoms Practice
Total questions: 42
Worksheet time: 21mins
Name
Class
Date
1.
The visible spectrum of light spans the range of approximately:
a)
300-500 nm
b)
400-600 nm
c)
300-700 nm
d)
400-700 nm
2.
Energy levels of electrons in an atom are:
a)
continuous
b)
discrete
c)
random
d)
variable
3.
A low-frequency wave has a __________ wavelength
a)
long
b)
short
c)
tall
d)
variable
4.
A high-frequency wave has a __________ wavelength
a)
long
b)
short
c)
tall
d)
variable
5.
The units of frequency are:
a)
meters/second
b)
cycles/meter
c)
cycles/second
d)
meters/cycle
6.
The Brackett series of hydrogen emission lines represent drops in energy from higher levels to the __________ level
a)
n = 1
b)
n = 2
c)
n = 3
d)
n = 4
e)
n = 5
7.
The emission spectrum for helium contains _____ lines than the hydrogen spectrum.
a)
more
b)
the same
c)
less
d)
it depends
e)
what's an emission spectrum?
8.
The photoelectric effect shows that light
a)
is composed of waves
b)
can be divided into discrete wavelengths
c)
has properties of a particle
d)
is continuous
9.
The photoelectric effect was first demonstrated by:
a)
Albert Einstein
b)
Robert Millikan
c)
John Dalton
d)
JJ Thomson
10.
The amplitude of a wave is its:
a)
frequency
b)
height
c)
wavelength
d)
velocity
11.
Frequency is represented by the Greek letter:
a)
η
b)
σ
c)
ν
d)
λ
12.
The wavelengths of infrared light are longer than those of visible light.
a)
True
b)
False
13.
An electron and a photon are the same mass.
a)
True
b)
False
14.
Electrons move to higher energy levels as they emit energy.
a)
True
b)
False
15.
Only two of the hydrogen emission lines are in the visible light region.
a)
True
b)
False
16.
The threshold frequency is the minimum frequency of light that will eject electrons from a surface.
a)
True
b)
False
17.
The Bohr model of the atom explains the emission lines of hydrogen.
a)
True
b)
False
18.
Electromagnetic radiation exhibits wavelike behavior.
a)
True
b)
False
19.
Electromagnetic radiation exhibits particle-like behavior.
a)
True
b)
False
20.
Light from a heated body is emitted at all wavelengths
a)
True
b)
False
21.
Light as a particle helps explain some experimental results.
a)
True
b)
False
22.
Classical physics could completely explain the photoelectric effect.
a)
True
b)
False
23.
The study of motion in large objects is called:
a)
traditional mechanics
b)
quantum mechanics
c)
classical mechanics
d)
quantized mechanics
24.
According to the Heisenberg Uncertainty Principle, the velocity and position of which of the following can never be measured very accurately?
a)
atomic emission lines
b)
a proton in motion
c)
a neutron in motion
d)
an electron in motion
25.
An electron cloud shows
a)
an 80% probability of finding an electron
b)
a 90% probability of finding an electron
c)
a 100% probability of finding an electron
d)
where all electrons are located
26.
Each electron can be described by __ quantum numbers.
a)
two
b)
four
c)
six
d)
eight
e)
ten
27.
The highest allowable sublevel for n = 3 is
a)
s
b)
p
c)
d
d)
f
e)
g
28.
The highest allowable sublevel for n = 4 is:
a)
s
b)
p
c)
d
d)
f
e)
g
29.
The quantum number representing spin has ___ values.
a)
1
b)
2
c)
3
d)
4
e)
5
30.
The units of mass in the de Broglie wave equation are:
a)
µg
b)
mg
c)
g
d)
kg
e)
Mg
31.
An increase in quantum number n means __________ in the distance of the electron from the nucleus.
a)
an increase
b)
no change
c)
a decrease
d)
a variable response
32.
If the principle quantum number n = 4, the angular momentum quantum number can have values for 0 to:
a)
1
b)
2
c)
3
d)
4
e)
5
33.
The magnetic quantum number tells us the:
a)
shape of the orbital
b)
orientation of the orbital around the nucleus
c)
distance of the orbital from the nucleus
d)
spin of the orbital
34.
The Bohr model of the atom only explains the behavior of the hydrogen electron.
a)
True
b)
False
35.
Electrons in atoms do not have defined energy levels.
a)
True
b)
False
36.
It is not possible to measure the exact velocity and location of a jet traveling at 650 miles/hour.
a)
True
b)
False
37.
The Schrödinger wave equation predicts the probability of finding an electron in a given area of space.
a)
True
b)
False
38.
The number of valence electrons in an atom of iodine is:
a)
5
b)
7
c)
10
d)
15
39.
Lower orbitals are filled before upper orbitals is a statement of:
a)
Hund's rule
b)
the Aufbau principle
c)
the Pauli exclusion principle
d)
the de Broglie principle
40.
Electron configuration superscripts indicate:
a)
orbital shape
b)
valence electrons
c)
number of electrons in a given sublevel
d)
number of reactive electrons
41.
According to the Aufbau principle, the ___ electrons are next in line of filling after the 6s electrons
a)
5d
b)
4f
c)
4d
d)
6p
42.
Unpaired electrons in orbitals are a consequence of:
a)
Hund's rule
b)
the Pauli exclusion principle
c)
the Aufbau principle
d)
Schrödinger equation
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