Name: ____________________________
Period: _____
Review for Unit 3 Exam
1. Name the three subatomic particles and
their electrical charges.
b. Argon, Ar
2. Draw and label an atom. [Make sure to label
the nucleus, electron cloud, protons, neutrons, and
electrons]
c. Aluminum, Al
3. Calculate the number of protons,
electrons, and neutrons for the following
elements
a. Radium, Ra
p+= _____, e-= _____, n0= _____
b. Tungsten, W
p+= _____, e-= _____, n0= _____
c. Bromine, Br
p+= _____, e-= _____, n0= _____
d. Hafnium, Hf
p+= _____, e-= _____, n0= _____
d. Calcium, Ca
4. Fill in the table with the correct
information about the scientist.
Scientist
Part of the atom
discovered
Year
Discovere
d
Chadwick
7. What is an isotope? Give an example from
your notes?
Rutherfor
d
Dalton
Bohr
Thompson
5. According to Bohr the farther away an
electron is from the nucleus the
_________________ energy.
6. Draw Bohr models for the following
elements:
a. Fluorine, F
8. The two stable isotopes of copper have
the following masses and percent
abundance in nature. Using the table
below, determine the average atomic mass
of the element copper
Isotopes
63
Cu
Isotopic
Mass
%
Abundance
62.93
69.09
65
Cu
64.93
30.91
9. The element gallium has two stable
isotopes. About 60% of the gallium atoms
found are gallium-69, while the remaining
40% are gallium-71. Calculate the average
atomic mass of gallium.
10. What are valence electrons?
11. How many valence electrons do the
following elements contain?
a. Rubidium, Rb:
Valence e-=______
b. Arsenic, As:
Valence e-=______
c. Astatine, At:
Valence e-=______
d. Indium, In:
Valence e-=______
e. Strontium, Sr:
Valence e-=______
f. Xenon, Xe:
Valence e-=______
g. Tellurium, Te:
Valence e-=______
12. Give the full electron configuration for
the following elements and circle the
valence electrons.
a. Iodine, I
b. Potassium, K
c. Gallium, Ga
d. Lithium, Li
e. Bismuth, Bi
13. Give the Noble Gas configuration for
the following elements:
a. Nobelium, No
b. Cesium, Cs
c. Tin, Sn
d. Actinium, Ac
e. Dubnium, Db