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UNIT 3
ATOMIC STRUCTURE
Practice Test
Name ______________________________
I) Vocabulary: Define the following terms or use them to describe related phenomena in
the space provided:
1.
2.
3.
4.
5.
6.
7.
8.
Atom
Element
Atomic mass unit
Atomic number
Ion
Mass number
Isotope
Isotope symbols
9. Average atomic mass
10. Radioactivity
11. Alpha decay
12. Alpha particle
13. Beta decay
14. Beta particle
II) History of the atomic theory: Briefly summarize the work of the following scientists
and describe the significance of that work to the development of our model of the atom.
1.
2.
3.
4.
Democritus
Aristotle
Lavoisier
Proust
5.
6.
7.
8.
Dalton
Thomson
Rutherford
Chadwick
III) Short essay: Answer two of the following questions in the space provided. Use full
sentences in paragraph form.
Possible topics include:
1)
2)
3)
4)
How is average atomic mass calculated?
How does a mass spectrometer work?
What is radioactivity? What are the 3 types of radiation and their basic properties?
Discuss/Explain
a) Law of Conservation of Matter
b) Law of Definite Proportions
c) Law of Multiple Proportions
d) Dalton’s Atomic Theory
e) Cathode Ray Tube Experiment
f) Rutherford’s Gold Foil Experiment
IV) Number of particles: Complete the following chart with the appropriate values for
neutral atoms.
ISOTOPE
SYMBOL
p+
n0
e-
ATOMIC
NUMBER
MASS
NUMBER
2
5
0
13
28
3+
20
21
20
9
24
charge
18
10
27
2+
V) Problems/Calculations: Solve the following problem in the space provided. Show as
much work as possible (to receive partial credit), include units, and circle your answer.
1) Calculate the average atomic mass of carbon given the following facts:
isotope
carbon-12
carbon-13
Mass
12.00
13.00
natural abundance
98.89%
1.11%
2) Write the isotope name and symbol for an atom that has 29 protons, 36
neutrons, and 27 electrons?
3) Write the nuclear equation for the alpha decay of radium-228
4) Write the nuclear equation for the beta decay of potassium-41