Name:     ID: 
 
Email: 

Topic 2: Atomic Structure

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
The smallest particle of an element that retains the properties of that element is a(n) ____.
a.
atom
c.
proton
b.
electron
d.
neutron
 

 2. 
Which of the following is NOT a part of Dalton's atomic theory?
a.
All elements are composed of atoms.
b.
Atoms are always in motion.
c.
Atoms of the same element are identical.
d.
Atoms that combine do so in simple whole-number ratios.
 

 3. 
The comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth is made to illustrate which of the following?
a.
that atoms are indivisible
b.
that atoms are very small
c.
that atoms are very large
d.
that in a copper penny, there is one atom for every person on Earth
 

 4. 
Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements?
a.
Cathode rays are negatively-charged particles.
b.
Cathode rays can be deflected by magnets.
c.
An electron is 2000 times lighter than a hydrogen atom.
d.
Charge-to-mass ratio of electrons was the same, regardless of the gas used.
 

 5. 
The particles that are found in the nucleus of an atom are ____.
a.
neutrons and electrons
c.
protons and neutrons
b.
electrons only
d.
protons and electrons
 

 6. 
The nucleus of an atom is ____.
a.
the central core and is composed of protons and neutrons
b.
positively charged and has more protons than neutrons
c.
negatively charged and has a high density
d.
negatively charged and has a low density
 

 7. 
An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are ____.
a.
152 protons and 76 electrons
c.
38 protons and 38 electrons
b.
76 protons and 0 electrons
d.
76 protons and 76 electrons
 

 8. 
Isotopes of the same element have different ____.
a.
positions on the periodic table
c.
atomic numbers
b.
chemical behavior
d.
mass numbers
 

 9. 
If E is the symbol for an element, which two of the following symbols represent isotopes of the same element?
1. mc009-1.jpgE2. mc009-2.jpgE3. mc009-3.jpgE4. mc009-4.jpgE
a.
1 and 2
c.
1 and 4
b.
3 and 4
d.
2 and 3
 

 10. 
The atomic mass of an element is the ____.
a.
total number of subatomic particles in its nucleus
b.
weighted average of the masses of the isotopes of the element
c.
total mass of the isotopes of the element
d.
average of the mass number and the atomic number for the element
 

 11. 
In the Bohr model of the atom, an electron in an orbit has a fixed ____.
a.
position
c.
energy
b.
color
d.
size
 

 12. 
How many energy sublevels are in the second principal energy level?
a.
1
c.
3
b.
2
d.
4
 

 13. 
What is the maximum number of d orbitals in a principal energy level?
a.
1
c.
3
b.
2
d.
5
 

 14. 
The shape (not the size) of an electron cloud is determined by the electron's ____.
a.
energy sublevel
c.
speed
b.
position
d.
principal quantum number
 

 15. 
According to the aufbau principle, ____.
a.
an orbital may be occupied by only two electrons
b.
electrons in the same orbital must have opposite spins
c.
electrons enter orbitals of highest energy first
d.
electrons enter orbitals of lowest energy first
 

 16. 
How many unpaired electrons are in a sulfur atom (atomic number 16)?
a.
0
c.
2
b.
1
d.
3
 

 17. 
How does the speed of visible light compare with the speed of gamma rays, when both speeds are measured in a vacuum?
a.
The speed of visible light is greater.
b.
The speed of gamma rays is greater.
c.
The speeds are the same.
d.
No answer can be determined from the information given.
 

 18. 
The light given off by an electric discharge through sodium vapor is ____.
a.
a continuous spectrum
c.
of a single wavelength
b.
an emission spectrum
d.
white light
 

 19. 
What is the approximate energy of a photon having a frequency of 4 mc019-1.jpg 10mc019-2.jpg Hz? (h = 6.6 mc019-3.jpg 10mc019-4.jpg Jmc019-5.jpgs)
a.
3 mc019-6.jpg 10mc019-7.jpg J
c.
2 mc019-10.jpg 10mc019-11.jpg J
b.
3 mc019-8.jpg 10mc019-9.jpg J
d.
3 mc019-12.jpg 10mc019-13.jpg J
 

 20. 
Which variable is directly proportional to frequency?
a.
wavelength
c.
position
b.
velocity
d.
energy
 

 21. 
What are quanta of light called?
a.
charms
c.
muons
b.
excitons
d.
photons
 

 22. 
The quantum mechanical model of the atom ____.
a.
defines the exact path of an electron around the nucleus
b.
was proposed by Niels Bohr
c.
involves the probability of finding an electron in a certain position
d.
has many analogies in the visible world
 

 23. 
According to the Heisenberg uncertainty principle, if the position of a moving particle is known, what other quantity CANNOT be known?
a.
mass
c.
spin
b.
charge
d.
velocity
 

Numeric Response
 

 24. 
How many electrons are in the highest occupied energy level of a neutral chlorine atom?

 



 
         Start Over