Question 1

Which of the following is a transition element?

Accepted Answer

A)   Pd
B)   Sn
C)   K
D)   U
E)   PrF) C) and D)
G) A) and B)

Question 2

Which of the following statements is FALSE according to John Dalton's reformulated atomic theory?

Accepted Answer

A)   Each element is composed of destructible particles called atoms.
B)   All atoms of a given element have the same mass as well as other properties.
C)   Compounds are formed when atoms combine in simple, whole-number ratios.
D)   Atoms composing one element cannot change into atoms of another element during a chemical reaction.
E)   All atoms of a given element have the same physical and chemical properties.F) B) and D)
G) B) and C)

Question 3

Identify the charges of protons, neutrons, and electrons.

Accepted Answer

A)   protons +1, neutrons 0, electrons -1
B)   protons 0, neutrons -1, electrons +1
C)   protons -1, neutrons 0, electrons +1
D)   protons 0, neutrons +1, electrons -1
E)   protons +1, neutrons -1, electrons 0F) C) and D)
G) None of the above

Question 4

Bromine has two naturally occurring isotopes, Br-79 and Br-81. The atomic mass of Br-79 is 78.9183 u with a percent abundance of 50.69% and the atomic mass of Br-81 is 80.9163 u. Calculate the atomic mass of bromine.

Accepted Answer

A)   80.91 u
B)   78.92 u
C)   79.90 u
D)   80.92 u
E)   80.03 uF) A) and B)
G) All of the above

Question 5

When forming an ion, fluorine, F, will ________ electron(s) .

Accepted Answer

A)   gain one
B)   gain two
C)   gain three
D)   lose one
E)   lose twoF) A) and E)
G) None of the above

Question 6

How many neutrons are in arsenic-42?

Accepted Answer

A)   33
B)   41
C)   9
D)   41.9
E)   75F) All of the above
G) C) and D)

Question 7

Identify the chemical symbol of element Q in  Q.

Accepted Answer

A)   Br
B)   Hg
C)   Pd
D)   SeE) A) and B)
F) A) and C)

Question 8

Match the following.
-magnesium

Accepted Answer

A)  Mg
B)  Fe
C)  Si
D)  K
E)  CF) B) and C)
G) C) and D)

Question 9

Predict the charge that a calcium ion would have.

Accepted Answer

A)   6-
B)   2-
C)   3+
D)   2+
E)   1+F) C) and E)
G) None of the above

Question 10

Calculate the atomic mass of chromium if chromium has four naturally occurring isotopes with the following masses and natural abundances: 
Cr-50 49.9461 u 4.35%
Cr-52 51.9405 u 83.79%
Cr-53 52.9407 u 9.50%
Cr-54 53.9389 u 2.36%

Accepted Answer

A)   51.94 u
B)   51.69 u
C)   208.7 u
D)   53.21 u
E)   52.00 uF) A) and B)
G) A) and D)

Question 11

Isotopes differ in the number of ________.

Accepted Answer

A)   protons
B)   neutrons
C)   electrons
D)   neutrons and electrons
E)   protons and electronsF) A) and D)
G) A) and C)

Question 12

Which of the following contains the most atoms? You shouldn't need to do a calculation here.

Accepted Answer

A)   10.0 g Ne
B)   10.0 g He
C)   10.0 g Ar
D)   10.0 g Kr
E)   10.0 g MgF) D) and E)
G) B) and E)

Question 13

Which of the following elements is classified as a semimetal?

Accepted Answer

A)   calcium
B)   boron
C)   fluorine
D)   uraniumE) All of the above
F) A) and B)

Question 14

What element is defined by the following information? p+ = 17 n° = 20 e- = 17

Accepted Answer

A)   calcium
B)   rubidium
C)   chlorine
D)   neon
E)   oxygenF) C) and D)
G) B) and C)

Question 15

How many protons (p)  and neutrons (n)  are in an atom of  Sr?

Accepted Answer

A)   38 p, 52 n
B)   38 p, 90 n
C)   52 p, 38 n
D)   90 p, 38 nE) B) and C)
F) A) and D)

Question 16

What mass (in kg)  does 5.84 moles of titanium (Ti)  have?

Accepted Answer

A)   0.352 kg
B)   0.122 kg
C)   0.820 kg
D)   0.280 kg
E)   0.632 kgF) B) and D)
G) A) and B)

Question 17

Match the following.
-carbon

Accepted Answer

A)  Mg
B)  Fe
C)  Si
D)  K
E)  CF) A) and E)
G) A) and B)

Question 18

Which one of the following elements is a poor conductor of heat and electricity?

Accepted Answer

A)   copper
B)   fluorine
C)   iron
D)   leadE) A) and B)
F) B) and C)

Question 19

Which of the following contains the fewest atoms? You shouldn't need to do a calculation here.

Accepted Answer

A)   4.0 g Li
B)   4.0 g Na
C)   4.0 g Rb
D)   4.0 g K
E)   4.0 g CaF) B) and D)
G) B) and C)

Question 20

How many electrons does the Ca2+ ion possess?

Accepted Answer

A)   27
B)   18
C)   9
D)   3
E)   20F) A) and E)
G) A) and D)

Exam 2: Atoms and Elements

What mass (in kg) does 5.84 moles of titanium (Ti) have?

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Which of the following elements is classified as a semimetal?

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What element is defined by the following information? p+ = 17 n° = 20 e- = 17

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Which one of the following elements is a poor conductor of heat and electricity?

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Match the following. -magnesium

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Which of the following contains the most atoms? You shouldn't need to do a calculation here.

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When forming an ion, fluorine, F, will ________ electron(s) .

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Bromine has two naturally occurring isotopes, Br-79 and Br-81. The atomic mass of Br-79 is 78.9183 u with a percent abundance of 50.69% and the atomic mass of Br-81 is 80.9163 u. Calculate the atomic mass of bromine.

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Which of the following contains the fewest atoms? You shouldn't need to do a calculation here.

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Which of the following is a transition element?

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How many electrons does the Ca2+ ion possess?

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Identify the charges of protons, neutrons, and electrons.

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Predict the charge that a calcium ion would have.

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How many protons (p) and neutrons (n) are in an atom of Sr?

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Identify the chemical symbol of element Q in Q.

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Match the following. -carbon

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How many neutrons are in arsenic-42?

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Calculate the atomic mass of chromium if chromium has four naturally occurring isotopes with the following masses and natural abundances: Cr-50 49.9461 u 4.35% Cr-52 51.9405 u 83.79% Cr-53 52.9407 u 9.50% Cr-54 53.9389 u 2.36%

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Which of the following statements is FALSE according to John Dalton's reformulated atomic theory?

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Isotopes differ in the number of ________.

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What element is defined by the following information? p⁺ = 17 n° = 20 e^- = 17

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How many electrons does the Ca²⁺ ion possess?

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