Question 1

The atomic number is abbreviated as _____.

Accepted Answer

A)   A
B)   N
C)   E
D)   P
E)   Z

Question 2

The most abundant element in the Earth's crust by mass is _____.

Accepted Answer

A)   hydrogen
B)   carbon
C)   oxygen
D)   silicon
E)   nitrogen

Question 3

Determine the mass in grams of one molecule of water, H2O.

Accepted Answer

A)   2.99 × 10 − 23 g
B)   1.08 × 1025 g
C)   10 grams
D)   18 grams
E)   None of these.

Question 4

The atomic mass of fluorine (F)  is 19.00. Which of the following is not true?

Accepted Answer

A)   An atom of F has a mass of 19.00 amu.
B)   One mole of F has a mass of 19.00 g.
C)   The mass of 6.02 x 1023 atoms of F is 19.00 g.
D)   The mass of 6.02 x 10  23  atoms of F is 19.00 amu.
E)   The approximate total number of protons and neutrons in fluorine is 19.

Question 5

What is the total number of electrons that can occupy the first and second principal energy levels ( n =1, n =2) ?

Accepted Answer

A)   2
B)   6
C)   8
D)   10
E)   18

Question 6

Which of the following is true?

Accepted Answer

A)   Argon and chlorine have the same number of electrons.
B)   Argon and chlorine have the same number of valence electrons.
C)   Argon and neon have the same number of electrons.
D)   Argon and neon have the same number of valence electrons.
E)   Argon and helium have the same number of electrons.

Question 7

Chlorine has two isotopes, 35Cl and 37Cl, whose respective abundances are 75.77% and 24.23% and masses are 34.9688 amu and 36.9659 amu. Calculate the atomic mass of chlorine.

Accepted Answer

A)   37.54 amu
B)   36.65 amu
C)   35.45 amu
D)   34.97 amu
E)   36.97 amu

Question 8

Which of these is the correct chemical symbol for potassium?

Accepted Answer

A)   K
B)   Po
C)   P
D)   Pd
E)   Pt

Question 9

Calculate the number of moles in a 233-gram sample of barium.

Accepted Answer

A)   0.589 moles
B)   1.70 moles
C)   3.20 × 104
D)   6.022 × 1023 moles
E)   1.02 × 1024 moles

Question 10

What is the maximum number of electrons that can occupy the orbit n =2?

Accepted Answer

A)   2
B)   6
C)   8
D)   10
E)   18

Question 11

Calculate the number of moles in a 2.98 g sample of aluminum.

Accepted Answer

A)   0.0124 moles
B)   0.110 moles
C)   80.4 moles
D)   1.79 × 1024 moles
E)   1.62 × 1025 moles

Question 12

Bromine is a member of which group/family?

Accepted Answer

A)   Halogens
B)   Noble gases
C)   Alkali metals
D)   Transition metals
E)   Alkaline earth metals

Question 13

Which of these groups is incorrectly matched with its group/family name?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   V

Question 14

Which of the following elements is not a nonmetal?

Accepted Answer

A)   P
B)   I
C)   N
D)   K
E)   Cl

Question 15

The Cl  −  ion contains _____ protons and _____ electrons.

Accepted Answer

A)   17; 17
B)   17; 18
C)   18; 16
D)   18; 18
E)   16; 17

Question 16

The elements Li, Na, K, Rb, and Cs are the members of which group/family?

Accepted Answer

A)   Halogens
B)   Noble gases
C)   Alkali metals
D)   Transition metals
E)   Alkaline earth metals

Question 17

Determine the mass in grams of 3.45 × 1025 molecules of oxygen, O2.

Accepted Answer

A)   0.556 grams
B)   57.2 grams
C)   458 grams
D)   916 grams
E)   1.83 × 103 grams

Question 18

Carbon has three isotopes:  12  C,  13  C, and  14  C. If the atomic number of carbon is 6, t hese  isotopes each have _____, _____, and _____ neutrons, respectively.

Accepted Answer

A)   6; 7; 8
B)   6; 7; 8.0
C)   12; 13; 14
D)   12.0; 13; 14
E)   24; 25; 26

Question 19

How many electrons are there in  15  N  3 −  ?

Accepted Answer

A)   15
B)   18
C)   12
D)   4
E)   10

Question 20

How many atoms does one mole of aluminum contain?

Accepted Answer

A)   12
B)   26.98
C)   6.022 × 1023
D)   12.044 x 1023
E)   14

Exam 3: Atoms and Elements

What is the maximum number of electrons that can occupy the orbit n =2?

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Which of these groups is incorrectly matched with its group/family name?

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How many electrons are there in 15 N 3 − ?

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Calculate the number of moles in a 2.98 g sample of aluminum.

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Which of these is the correct chemical symbol for potassium?

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Which of the following elements is not a nonmetal?

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What is the total number of electrons that can occupy the first and second principal energy levels ( n =1, n =2) ?

Correct AnswerverifiedShow Answer

Chlorine has two isotopes, 35Cl and 37Cl, whose respective abundances are 75.77% and 24.23% and masses are 34.9688 amu and 36.9659 amu. Calculate the atomic mass of chlorine.

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Determine the mass in grams of one molecule of water, H2O.

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Carbon has three isotopes: 12 C, 13 C, and 14 C. If the atomic number of carbon is 6, t hese isotopes each have _____, _____, and _____ neutrons, respectively.

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Calculate the number of moles in a 233-gram sample of barium.

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The atomic mass of fluorine (F) is 19.00. Which of the following is not true?

Correct AnswerverifiedShow Answer

The elements Li, Na, K, Rb, and Cs are the members of which group/family?

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Determine the mass in grams of 3.45 × 1025 molecules of oxygen, O2.

Correct AnswerverifiedShow Answer

The most abundant element in the Earth's crust by mass is _____.

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Which of the following is true?

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The Cl − ion contains _____ protons and _____ electrons.

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Bromine is a member of which group/family?

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How many atoms does one mole of aluminum contain?

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The atomic number is abbreviated as _____.

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How many electrons are there in ¹⁵ N ^{3 −} ?

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Determine the mass in grams of one molecule of water, H₂O.

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Carbon has three isotopes: ¹² C, ¹³ C, and ¹⁴ C. If the atomic number of carbon is 6, t hese isotopes each have ___, _, and ___ neutrons, respectively.

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Determine the mass in grams of 3.45 × 10²⁵ molecules of oxygen, O_2.

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The Cl ⁻ ion contains _ protons and _ electrons.

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