Question 1

The mass number of an atom of 67Ga is ________.

Accepted Answer

A)   31
B)   76
C)   36
D)   67
E)   70

Question 2

Identify a cation.

Accepted Answer

A)   An atom that has lost (an)  electron(s) .
B)   An atom that has gained (an)  electron(s) .
C)   An atom that has lost (a)  proton(s) .
D)   An atom that has gained (a)  proton(s) .

Question 3

Magnesium tends to lose ________ electron(s)  to attain a noble gas configuration.

Accepted Answer

A)   3
B)   4
C)   5
D)   2
E)   1 D

Question 4

Which of the following statements about subatomic particles is TRUE?

Accepted Answer

A)   A neutral atom contains the same number of protons and electrons.
B)   Protons have about the same mass as electrons.
C)   Electrons make up most of the mass of an atom.
D)   Protons and neutrons have opposite, but equal in magnitude, charges.
E)   Neutrons and electrons are found in the nucleus of an atom.

Question 5

Which element has the chemical symbol Ru?

Accepted Answer

A)   rubidium
B)   ruthenium
C)   rutherfordium
D)   rhodium

Question 6

In which of the following sets do all species have the same number of electrons?

Accepted Answer

A)   F-, Ne, Mg2+
B)   Ge, Se2-, Br-
C)   K+, Rb+, Cs+
D)   Br, Br-, Br+

Question 7

Identify the largest by size atom or ion of carbon.

Accepted Answer

A)   p+ = 6 n° = 6 e- = 6
B)   p+ = 6 n° = 7 e- = 6
C)   p+ = 6 n° = 6 e- = 7
D)   p+ = 6 n° = 6 e- = 5

Question 8

If 102.7 g of tin is mixed with 10.9 g of copper to create the alloy pewter, how many moles of metal are present in the pewter?

Accepted Answer

A)   0.9643 mol total
B)   1.037 mol total
C)   0.6233 mol total
D)   1.604 mol total
E)   0.8675 mol total

Question 9

Why doesn't a mass spectrum of silver have a peak at 107.9 u?

Accepted Answer

The average atomic mass of sil...

Question 10

What species is represented by the following information? p+ = 17 n° = 18 e- = 18

Accepted Answer

A)   Cl
B)   Cl-
C)   Ar
D)   Ar+
E)   Kr

Question 11

What mass (in mg)  does 2.63 moles of nickel have?

Accepted Answer

A)   44.8 mg
B)   2.23 × 104 mg
C)   129 mg
D)   3.56 × 105 mg
E)   1.54 × 105 mg

Question 12

An atom of 31P contains ________ protons.

Accepted Answer

A)   15
B)   40
C)   22
D)   25
E)   31

Question 13

Which of the following statements about isotopes is TRUE?

Accepted Answer

A)   Isotopes of the same element differ only in the number of electrons they contain.
B)   An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons.
C)   Isotopes of the same element have the same mass.
D)   Isotopes of the same element don't usually have the same properties.
E)   Some elements have three or more naturally occurring isotopes.

Question 14

Give the name of the instrument that is used to measure masses of atoms and the percent abundance of isotopes.

Accepted Answer

mass spectrometer

Question 15

Carbon has two naturally occurring isotopes, carbon-12 and carbon-13. The more common isotope of carbon is carbon-12 with an abundance of 98.93% while carbon-13 has an atomic mass of 13.00335 u. Calculate the atomic mass of carbon-12 if the atomic mass of carbon is 12.0107 u.

Accepted Answer

A)   13.1 u
B)   13.0 u
C)   12.0 u
D)   12.8 u
E)   12.4 u

Question 16

Argon belongs to the ________ group of the periodic table.

Accepted Answer

A)   alkali metal
B)   alkaline earth metal
C)   halogen
D)   noble gas

Question 17

Which of the following describes a metal?

Accepted Answer

A)   poor conductor of heat
B)   good conductor of electricity
C)   tends to gain electrons
D)   forms ionic compounds with group 18 elements
E)   found on the upper right corner of the periodic table

Question 18

Are anions typically larger or smaller than their corresponding atom? Why?

Accepted Answer

Anions are larger than their correspondi...

Question 19

Iodine belongs to the ________ group of the periodic table.

Accepted Answer

A)   alkali metal
B)   alkaline earth metal
C)   halogen
D)   noble gas C

Question 20

All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements. Which law does this refer to?

Accepted Answer

A)   Law of definite proportions
B)   Law of the conservation of mass
C)   Law of modern atomic theory
D)   Law of multiple proportions
E)   First law of thermodynamics

Exam 2: Atoms and Elements

The mass number of an atom of 67Ga is ________.

Correct AnswerverifiedShow Answer

Identify a cation.

Correct AnswerverifiedShow Answer

Magnesium tends to lose ________ electron(s) to attain a noble gas configuration.

Correct AnswerverifiedD

Which of the following statements about subatomic particles is TRUE?

Correct AnswerverifiedShow Answer

Which element has the chemical symbol Ru?

Correct AnswerverifiedShow Answer

In which of the following sets do all species have the same number of electrons?

Correct AnswerverifiedShow Answer

Identify the largest by size atom or ion of carbon.

Correct AnswerverifiedShow Answer

If 102.7 g of tin is mixed with 10.9 g of copper to create the alloy pewter, how many moles of metal are present in the pewter?

Correct AnswerverifiedShow Answer

Why doesn't a mass spectrum of silver have a peak at 107.9 u?

Correct AnswerverifiedThe average atomic mass of sil...View AnswerShow Answer

What species is represented by the following information? p+ = 17 n° = 18 e- = 18

Correct AnswerverifiedShow Answer

What mass (in mg) does 2.63 moles of nickel have?

Correct AnswerverifiedShow Answer

An atom of 31P contains ________ protons.

Correct AnswerverifiedShow Answer

Which of the following statements about isotopes is TRUE?

Correct AnswerverifiedShow Answer

Give the name of the instrument that is used to measure masses of atoms and the percent abundance of isotopes.

Correct Answerverifiedmass spectrometer

Carbon has two naturally occurring isotopes, carbon-12 and carbon-13. The more common isotope of carbon is carbon-12 with an abundance of 98.93% while carbon-13 has an atomic mass of 13.00335 u. Calculate the atomic mass of carbon-12 if the atomic mass of carbon is 12.0107 u.

Correct AnswerverifiedShow Answer

Argon belongs to the ________ group of the periodic table.

Correct AnswerverifiedShow Answer

Which of the following describes a metal?

Correct AnswerverifiedShow Answer

Are anions typically larger or smaller than their corresponding atom? Why?

Correct AnswerverifiedAnions are larger than their correspondi...View AnswerShow Answer

Iodine belongs to the ________ group of the periodic table.

Correct AnswerverifiedC

All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements. Which law does this refer to?

Correct AnswerverifiedShow Answer

The mass number of an atom of ⁶⁷Ga is ________.

Correct Answer
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D

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The average atomic mass of sil...
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What species is represented by the following information? p⁺ = 17 n° = 18 e^- = 18

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An atom of ³¹P contains ________ protons.

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mass spectrometer

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Anions are larger than their correspondi...
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C

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