Technical Chemistry
Chapter 3 Review
Name
Date
Block
DIRECTIONS: Using what you have learned about Atoms, answer the following questions
on a separate sheet of paper. Use resources such as your notes, textbook, periodic table,
and any labs you may have done to answer these questions.
1. As you have learned, the atom has dramatically changed throughout history.
Discuss the following scientists/philosophers and how their ideas helped influence
these views. Include any philosophies, theories, laws, experiments, discoveries, and
models that these people were responsible for.
 Democritus
 Aristotle
 Antoine Lavoisier
 Joseph Proust
 Ben Franklin
 John Dalton
 Michael Faraday
 JJ Thomson
 Henri Becquerel
 Robert Millikan
 Ernest Rutherford
2. Atomic Number =
3. Mass Number =
4. Isotopes have the same number of
and
different numbers of
.
5. Chlorine is made up of 2 isotopes with masses of 34.969g and 36.966g. The
corresponding relative abundances are 75.800% and 24.20%. Calculate the Average
Atomic Mass.
6. Ions have the same number of
and
different numbers of
.
ELEMEN
T
SYMBOL
ATOMIC MASS
# OF
# OF
# OF
ATOM or
NUMBER NUMBER PROTONS NEUTRONS ELECTRONS ION
Turn over for some awesome mole conversions!
Bromine
45
26
56
37
+3 ion
79
7. How many grams are in 4.67 moles of Calcium?
8. How many atoms are in 4.67 moles of Calcium?
9. How many grams are in 2.99 x 1025 atoms of Boron?
10. How many atoms are in 33.6g of Magnesium?
197
atom