Question 1

The mass number of an atom can be calculated from

Accepted Answer

A)  the number of neutrons.
B)  the number of electrons.
C)  the number of electrons plus protons.
D)  the number of protons plus neutrons.
E)  the number of protons.F) A) and E)
G) C) and D)

Question 2

The element in this list with chemical properties similar to magnesium is

Accepted Answer

A)  sodium.
B)  chlorine.
C)  boron.
D)  strontium.
E)  carbon.F) B) and C)
G) B) and D)

Question 3

The elements lithium, sodium, and potassium

Accepted Answer

A)  have the same mass number.
B)  have the same number of neutrons.
C)  are isotopes of each other.
D)  are in the same group.
E)  are in the same period of elements.F) All of the above
G) A) and B)

Question 4

The number of dots in the electron dot structure of nitrogen is

Accepted Answer

A)  one.
B)  two.
C)  three.
D)  four.
E)  five.F) A) and E)
G) A) and B)

Question 5

Consider an isotope of sodium with a mass number of 25. The number of neutrons in this isotope of sodium is

Accepted Answer

A)  32.
B)  11.
C)  16.
D)  25.
E)  14.F) A) and D)
G) A) and C)

Question 6

The atomic mass of an element is equal to

Accepted Answer

A)  its mass number.
B)  the average mass of all of the naturally occurring isotopes of the element.
C)  its atomic number.
D)  one-twelfth of the mass of a carbon-12 atom.
E)  a weighted average mass of all of the naturally occurring isotopes of the element.F) All of the above
G) A) and B)

Question 7

Select the correct symbol for the element.
-potassium

Accepted Answer

A)  Po
B)  Pt
C)  P
D)  K
E)  KoF) C) and E)
G) A) and C)

Question 8

Select the correct symbol for the element.
-mercury

Accepted Answer

A)  Au
B)  Hg
C)  Ag
D)  Mc
E)  PbF) D) and E)
G) B) and D)

Question 9

Identify the metalloid in the following list.

Accepted Answer

A)  sulfur
B)  copper
C)  silver
D)  fluorine
E)  germaniumF) B) and E)
G) None of the above

Question 10

How many valence electrons are in the electron-dot structures for the elements in group 3A(13) ?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  6F) All of the above
G) None of the above

Question 11

What is the element with the electron configuration

Accepted Answer

A)  Cl
B)  S
C)  F
D)  Ar
E)  BeF) A) and D)
G) A) and B)

Question 12

Write in the electronic configuration for the atom shown.
-Sodium

Accepted Answer

The answer of Write in the electronic configuration for the...

Question 13

Chlorine has two naturally occurring isotopes. The isotope Cl-35 (mass = 35.0 amu) makes up 75.8% of the sample, and the isotope Cl-37 (mass = 37.0 amu) makes up 24.2% of the sample. What is the average atomic
Mass for chlorine?

Accepted Answer

A)  36.6 amu
B)  35 amu
C)  36.0 amu
D)  35.521 amu
E)  35.5 amuF) A) and B)
G) A) and C)

Question 14

Identify the noble gas in the following list.

Accepted Answer

A)  gold
B)  chlorine
C)  helium
D)  oxygen
E)  nitrogenF) D) and E)
G) B) and E)

Question 15

Of the elements: Li, Na, K, Rb, and Cs, the element with the most metallic character is

Accepted Answer

A)  Li.
B)  Na.
C)  K.
D)  Rb.
E)  Cs.F) None of the above
G) A) and E)

Question 16

The smallest particle of an element that retains the characteristics of the element is a(n)

Accepted Answer

A)  neutron.
B)  atom.
C)  nucleus.
D)  electron.
E)  proton.F) A) and D)
G) D) and E)

Question 17

The maximum number of electrons that may occupy the third energy level is

Accepted Answer

A)  18.
B)  32.
C)  8.
D)  10.
E)  2.F) A) and D)
G) C) and D)

Question 18

Which of the following is the correct electron-dot structure for carbon?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and E)
G) B) and D)

Question 19

Write in the electronic configuration for the atom shown.
-Sulfur

Accepted Answer

The answer of Write in the electronic configuration for the...

Question 20

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

Accepted Answer

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

Exam 4: Atoms and Elements

Of the elements: Li, Na, K, Rb, and Cs, the element with the most metallic character is

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Select the correct symbol for the element. -mercury

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Identify the noble gas in the following list.

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The atomic mass of an element is equal to

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The elements lithium, sodium, and potassium

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Which of the following is the correct electron-dot structure for carbon?

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The element in this list with chemical properties similar to magnesium is

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The mass number of an atom can be calculated from

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Consider an isotope of sodium with a mass number of 25. The number of neutrons in this isotope of sodium is

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The number of dots in the electron dot structure of nitrogen is

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Identify the metalloid in the following list.

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What is the element with the electron configuration

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Chlorine has two naturally occurring isotopes. The isotope Cl-35 (mass = 35.0 amu) makes up 75.8% of the sample, and the isotope Cl-37 (mass = 37.0 amu) makes up 24.2% of the sample. What is the average atomic Mass for chlorine?

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How many valence electrons are in the electron-dot structures for the elements in group 3A(13) ?

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Select the correct symbol for the element. -potassium

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The smallest particle of an element that retains the characteristics of the element is a(n)

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The maximum number of electrons that may occupy the third energy level is

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Write in the electronic configuration for the atom shown. -Sulfur

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Write in the electronic configuration for the atom shown. -Sodium

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

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