Question 1

Sulfur has 16 valence electrons.

Accepted Answer

A) True 
 B)False

Question 2

Potassium has one valence electron.

Accepted Answer

A) True 
 B)False

Question 3

Write the electron arrangement for the atom shown.
-The symbol for lead is ________.

Accepted Answer

Pb

Question 4

A lead atom with a mass number of 208 has 126 neutrons.

Accepted Answer

A) True 
 B)False

Question 5

Valence electrons are electrons located ________.

Accepted Answer

A)  in the outermost energy level of an atom
B)  in the nucleus of an atom
C)  in the innermost energy level of an atom
D)  throughout the atom
E)  in the first three shells of an atom

Question 6

What is the mass number of an atom of potassium that has 20 neutrons?

Accepted Answer

A)  15
B)  19
C)  35
D)  39
E)  59

Question 7

The number of electrons in the outer energy level of a neutral atom of boron (atomic number 5) is ________.

Accepted Answer

A)  2
B)  3
C)  5
D)  8
E)  10

Question 8

The metallic character of elements ________.

Accepted Answer

A)  increases going across a period
B)  decreases going down within a group
C)  increases going down within a group
D)  does not change going down within a group
E)  none of the above C

Question 9

The number of valence electrons found in an atom of a Group A element is equal to ________.

Accepted Answer

A)  its atomic number
B)  its mass number
C)  its group number
D)  eight
E)  eight minus the group number

Question 10

Write the electron arrangement for the atom shown.
-The symbol for calcium is ________.

Accepted Answer

The answer of Write the electron arrangement for the atom...

Question 11

Write the electron arrangement for the atom shown.
-Sodium

Accepted Answer

The answer of Write the electron arrangement for the atom...

Question 12

Consider a neutral atom with 30 protons and 34 neutrons.The mass number for this atom is ________.

Accepted Answer

A)  30
B)  32
C)  34
D)  64
E)  94

Question 13

The atomic mass of an element is equal to ________.

Accepted Answer

A)  its mass number
B)  its atomic number
C)  one-twelfth of the mass of a carbon-12 atom
D)  the mass of an "average atom"
E)  the mass of the heaviest isotope

Question 14

Which of the following is a characteristic of the modern periodic table?

Accepted Answer

A)  A group is a horizontal row on the periodic table.
B)  A period is a column on the periodic table.
C)  The elements in each group have similar chemical properties.
D)  The B groups contain the representative elements.
E)  The A groups contain the transition elements. C

Question 15

Consider a neutral atom with 30 protons and 34 neutrons.The number of electrons in this atom is ________.

Accepted Answer

A)  30
B)  32
C)  34
D)  64
E)  94

Question 16

Semiconductors are located in the periodic table on (or in) the ________.

Accepted Answer

A)  left side of the table
B)  right side of the table
C)  line dividing metals from nonmetals in the table
D)  first period of the table
E)  last period of the table

Question 17

Which element would have physical and chemical properties similar to chlorine?

Accepted Answer

A)  Ar
B)  Br
C)  S
D)  O
E)  P

Question 18

Identify the noble gas in the following list.

Accepted Answer

A)  helium
B)  nitrogen
C)  oxygen
D)  gold
E)  chlorine

Question 19

Write the electron arrangement for the atom shown.
-The symbol for gold is Au.

Accepted Answer

A) True 
 B)False

Question 20

What element has the electron arrangement 2,8,4?

Accepted Answer

A)  carbon
B)  oxygen
C)  sulfur
D)  iron
E)  silicon

Exam 4: Atoms and Elements

Sulfur has 16 valence electrons.

Correct AnswerverifiedShow Answer

Potassium has one valence electron.

Correct AnswerverifiedShow Answer

Write the electron arrangement for the atom shown. -The symbol for lead is ________.

Correct AnswerverifiedPb

A lead atom with a mass number of 208 has 126 neutrons.

Correct AnswerverifiedShow Answer

Valence electrons are electrons located ________.

Correct AnswerverifiedShow Answer

What is the mass number of an atom of potassium that has 20 neutrons?

Correct AnswerverifiedShow Answer

The number of electrons in the outer energy level of a neutral atom of boron (atomic number 5) is ________.

Correct AnswerverifiedShow Answer

The metallic character of elements ________.

Correct AnswerverifiedC

The number of valence electrons found in an atom of a Group A element is equal to ________.

Correct AnswerverifiedShow Answer

Write the electron arrangement for the atom shown. -The symbol for calcium is ________.

Correct AnswerverifiedShow Answer

Write the electron arrangement for the atom shown. -Sodium

Correct AnswerverifiedShow Answer

Consider a neutral atom with 30 protons and 34 neutrons.The mass number for this atom is ________.

Correct AnswerverifiedShow Answer

The atomic mass of an element is equal to ________.

Correct AnswerverifiedShow Answer

Which of the following is a characteristic of the modern periodic table?

Correct AnswerverifiedC

Consider a neutral atom with 30 protons and 34 neutrons.The number of electrons in this atom is ________.

Correct AnswerverifiedShow Answer

Semiconductors are located in the periodic table on (or in) the ________.

Correct AnswerverifiedShow Answer

Which element would have physical and chemical properties similar to chlorine?

Correct AnswerverifiedShow Answer

Identify the noble gas in the following list.

Correct AnswerverifiedShow Answer

Write the electron arrangement for the atom shown. -The symbol for gold is Au.

Correct AnswerverifiedShow Answer

What element has the electron arrangement 2,8,4?

Correct AnswerverifiedShow Answer

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Pb

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C

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C

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