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Solving Problems: A Chemistry Handbook
Chemistry: Matter and Change
33
SOLVING PROBLEMS:
A CHEMISTRY HANDBOOK
CHAPTER 4
Practice Problems
1. Select the term in Column B that best matches the phrase in
Column A.
Column A
Column B
a. Cathode ray
b. Discovered in 1932
c. Caused large deflections of alpha
particles in Rutherford’s experiment
d. Has a charge of 1Ϫ
e. Has no charge
f. Contains nearly all of an atom’s mass
g. In an atom, the number of these
particles is equal to the number of
protons.
h. Identified by Thomson
i. Site of an atom’s positive charge
j. Has a positive charge and relative
mass of 1
k. The center of an atom
l. Symbolized by n 0
4.3 How Atoms Differ
It is important to be able to obtain useful information from the
periodic table. Starting with the simplest element, hydrogen, the
periodic table represents each element in a box.
Information about an element The name of the element and
its chemical symbol are given in each box. The integer in the box
represents the element’s atomic number, the number of protons in a
nucleus of an atom of that element. As you scan the table, you can
see that the elements are arranged in order of increasing atomic
number and that the sequence of atomic numbers has no missing
values. This continuous series is an indication of the fact that the
atomic number determines the identity of an element.
▲
1. electron
2. proton
3. neutron
4. nucleus