The Periodic Table

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The Periodic Table
Chapter 12
Preview
CRCT Preparation
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CRCT Preparation
Chapter 12
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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CRCT Preparation
Chapter 12
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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CRCT Preparation
Chapter 12
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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CRCT Preparation
Chapter 12
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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CRCT Preparation
Chapter 12
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 metall
oids
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CRCT Preparation
Chapter 12
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 metall
oids
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CRCT Preparation
Chapter 12
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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CRCT Preparation
Chapter 12
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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CRCT Preparation
Chapter 12
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.
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CRCT Preparation
Chapter 12
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.
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CRCT Preparation
Chapter 12
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
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CRCT Preparation
Chapter 12
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
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CRCT Preparation
Chapter 12
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 and nickel belong to the same group on
the periodic table.
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CRCT Preparation
Chapter 12
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 and nickel belong to the same group on
the periodic table.
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CRCT Preparation
Chapter 12
8. Which of the following statements about a
family/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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CRCT Preparation
Chapter 12
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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CRCT Preparation
Chapter 12
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.
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CRCT Preparation
Chapter 12
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.
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• 10. Which of the following is a property of
  alkali metals?
• A. They are so hard they cannot be cut
• B. They are the most reactive metals
• C. They are stored in water
• D. They have few uses

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• 10. Which of the following is a property of
  alkali
• metals?
• A. They are so hard they cannot be cut
• B. They are the most reactive metals
• C. They are stored in water
• D. They have few uses

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CRCT Preparation
Chapter 12
10. In Mendeleevs 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 Moseleys
revision to the periodic table.
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CRCT Preparation
Chapter 12
10. Answer - Full-credit answers should include
the following Moseleys 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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CRCT Preparation
Chapter 12
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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CRCT Preparation
Chapter 12
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.