Chapter 12
The Periodic Table
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Chapter 12
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1. What does the number at the top of the square
above tell you about carbon?
A A carbon nucleus has 6 protons.
B Carbon has an average atomic mass of 6.
C Carbon has 6 isotopes.
D A carbon atom has 6 electrons in its outermost
energy level.
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Chapter 12
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1. What does the number at the top of the square
above tell you about carbon?
A A carbon nucleus has 6 protons.
B Carbon has an average atomic mass of 6.
C Carbon has 6 isotopes.
D A carbon atom has 6 electrons in its outermost
energy level.
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Chapter 12
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2. Approximately how many elements are in the
periodic table?
A between 75 and 100
B between 100 and 125
C between 125 and 150
D more than 150
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Chapter 12
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2. Approximately how many elements are in the
periodic table?
A between 75 and 100
B between 100 and 125
C between 125 and 150
D more than 150
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3. Alberto has an element that is a shiny, brittle solid
that conducts electric current. The element most likely
belongs to which class of elements?
A halogens
B metals
C nonmetals
D metalloids
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Chapter 12
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3. Alberto has an element that is a shiny, brittle solid
that conducts electric current. The element most likely
belongs to which class of elements?
A halogens
B metals
C nonmetals
D metalloids
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Chapter 12
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4. In what order are the regions arranged on the
periodic table when you read it from left to right?
A noble gases, metals, nonmetals, metalloids
B metalloids, metals, nonmetals, noble gases
C metals, metalloids, nonmetals, noble gases
D nonmetals, noble gases, metals, metalloids
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Chapter 12
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4. In what order are the regions arranged on the
periodic table when you read it from left to right?
A noble gases, metals, nonmetals, metalloids
B metalloids, metals, nonmetals, noble gases
C metals, metalloids, nonmetals, noble gases
D nonmetals, noble gases, metals, metalloids
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5. Fluorine, chlorine, bromine, iodine, and astatine
make up Group 17, the halogens. Why are these
elements grouped together?
A They are all very reactive nonmetals that have
similar chemical properties.
B They are all nonreactive gases that have similar
physical properties.
C Their atoms all have 8 electrons in their outer energy
levels.
D They all have the same atomic number.
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Chapter 12
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5. Fluorine, chlorine, bromine, iodine, and astatine
make up Group 17, the halogens. Why are these
elements grouped together?
A They are all very reactive nonmetals that have
similar chemical properties.
B They are all nonreactive gases that have similar
physical properties.
C Their atoms all have 8 electrons in their outer energy
levels.
D They all have the same atomic number.
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Chapter 12
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6. Which of the following best describes the properties
of metals?
A hard, brittle, and nonconductive
B liquid, dark, and conductive
C shiny, malleable, and conductive
D soft, oily, and very reactive
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Chapter 12
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6. Which of the following best describes the properties
of metals?
A hard, brittle, and nonconductive
B liquid, dark, and conductive
C shiny, malleable, and conductive
D soft, oily, and very reactive
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7. Which of the following statements about cobalt (Co)
and nickel (Ni) is true?
A Nickel has a greater
average atomic mass
than cobalt does.
B Nickel atoms have
more protons than cobalt
atoms do.
C Cobalt atoms have more electrons than nickel
atoms do.
D Cobalt and nickel belong to the same group on
the periodic table.
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Chapter 12
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7. Which of the following statements about cobalt (Co)
and nickel (Ni) is true?
A Nickel has a greater
average atomic mass
than cobalt does.
B Nickel atoms have
more protons than cobalt
atoms do.
C Cobalt atoms have more electrons than nickel
atoms do.
D Cobalt and nickel belong to the same group on
the periodic table.
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8. Which of the following statements about a group of
elements is true?
A Atoms of the elements have the same number of
neutrons.
B Atoms of the elements have the same atomic
number.
C The elements have similar properties.
D The elements have the same average atomic mass.
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Chapter 12
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8. Which of the following statements about a group of
elements is true?
A Atoms of the elements have the same number of
neutrons.
B Atoms of the elements have the same atomic
number.
C The elements have similar properties.
D The elements have the same average atomic mass.
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9. What is the purpose of the zigzag line on the right
side of the periodic table?
A It divides the metals and nonmetals and shows
where the metalloids are.
B It indicates a group of elements that have the same
chemical properties.
C It connects the elements in the table that have the
same atomic number.
D It marks the border between the alkali metals and the
transition metals.
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Chapter 12
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9. What is the purpose of the zigzag line on the right
side of the periodic table?
A It divides the metals and nonmetals and shows
where the metalloids are.
B It indicates a group of elements that have the same
chemical properties.
C It connects the elements in the table that have the
same atomic number.
D It marks the border between the alkali metals and the
transition metals.
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10. In Mendeleev’s periodic table, the element iodine
(I) came before tellurium (Te). He arranged the
elements by atomic weight. Later, Henry Moseley
revised the table to place iodine after tellurium. Explain
the basis for Moseley’s revision to the periodic table.
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10. Answer - Full-credit answers should include the
following:
Moseley’s version of the periodic table is based on
atomic number, not atomic mass. Some elements have
higher atomic masses than the following element that
has a higher atomic number. Therefore, some elements
were rearranged when atomic numbers were
discovered and used to organize the periodic table.
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11. Sodium and potassium are members of the alkali
metal group. What properties do sodium and potassium
share with each other and with the other members of
the alkali metal group? Describe at least four
properties.
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11. Answer - Full-credit answers should include at least
four of the following points:
• Members of the alkali metals are all metals and
therefore are shiny and are good conductors.
• Alkali metals are soft and can be cut with a knife.
• Atoms of alkali metals have one electron in their
outermost energy level.
• Alkali metals have low densities.
• Alkali metals are very reactive.
• Alkali metals are silver in color.
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