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Standards-Based Assessment
TEST PRACTICE
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Interpreting Tables
8.3.a, 8.7.c
The table below shows part of the periodic table of elements.
Group
1
1
Period
s8pe-207st-ca
2
3
4
18
1
2
H
2
13
14
15
16
17
He
3
4
5
6
7
8
9
10
Li
Be
B
C
N
O
F
Ne
11
12
13
14
15
16
17
18
Al
Si
P
S
Cl
Ar
Na Mg
19
20
31
32
33
34
35
36
K
Ca
Ga
Ge
As
Se
Br
Kr
Answer the questions based on the information given
in the table.
1. What does the number above the symbol for each
element represent?
a.
b.
c.
d.
its
its
its
its
number of isotopes
atomic number
number of neutrons
atomic mass
2. The atom of what element is in Period 4,
Group 13?
a. Na
c. Al
b. Ga
d. K
Extended Response
Answer the following two questions in detail. Include
some of the terms shown in the word box at right.
Underline each term you use in your answer.
7. Democritus was an ancient Greek philosopher who
claimed that all matter was made of tiny particles
he called atoms. Democritus said that all atoms
were made of the same material. The objects of
the world differed because each was made of
atoms of different sizes and shapes. How does
the modern view of atoms differ from this ancient
view? How is it similar?
3. What do the elements on the far right of the table
(He, Ne, Ar, and Kr) have in common?
a. They do not generally react with other elements.
b. They are liquids under normal conditions.
c. They are metals that rust easily.
d. They are very reactive gases.
4. How many electrons does a neutral chlorine (Cl)
atom contain?
a. 16
c. 18
b. 17
d. 19
5. If a sodium (Na) atom loses one electron to form a
positive ion, how many electrons would lithium (Li)
lose to form a positive ion?
a. 0
c. 2
b. 1
d. 3
6. If a fluorine (F) atom gains one electron to form a
negative ion, how many electrons would bromine
(Br) gain to form a negative ion?
a. 0
c. 2
b. 1
d. 3
electron
isotope
nucleus
neutron
proton
radioactivity
8. Half-life is a measure of the time it takes half of
the radioactive atoms in a substance to decay into
other atoms. If you know how much radioactive
material an object had to begin with, how could
you use half-life to determine its age now?
Chapter 7: Atomic Structure and the Periodic Table 233
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