Question 1

Rutherford's scattering experiment demonstrated

Accepted Answer

A)  the existence of protons.
B)  the existence of electrons.
C)  the existence of neutrons.
D)  that most of the mass of an atom is in its nucleus.
E)  that the charge-to-mass ratio of an electron is constant.F) C) and D)
G) C) and E)

Question 2

Which of the following statements regarding ion formation is incorrect?

Accepted Answer

A)  Nonmetals usually gain electrons to form ions that have a noble gas electron count.
B)  Main-group metals usually lose electrons to form ions that have a noble gas electron count.
C)  Elements in the same group often form ions of the same charge.
D)  The charge of any element's ion can be simply predicted using the periodic table.
E)  All of these statements are correct.F) A) and C)
G) All of the above

Question 3

Select the element that is an alkali metal in Period 3.

Accepted Answer

A)  Na
B)  Mg
C)  Al
D)  K
E)  CaF) B) and C)
G) A) and E)

Question 4

Boron has two isotopes: B-10 and B-11, with masses of 10.013 amu and 11.009 amu, respectively.The relative atomic mass of boron is 10.81 amu.Which statement best describes the percent abundance of the isotopes of boron?

Accepted Answer

A)  It contains more B-10 than B-11.
B)  It contains more B-11 than B-10.
C)  It contains equal amounts of B-10 and B-11.
D)  There must be a third isotope of boron.
E)  A mass spectrum of boron is necessary to answer this question.F) A) and D)
G) A) and E)

Question 5

This figure shows a chemical reaction taking place.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following statements regarding the nucleus of the atom is incorrect?

Accepted Answer

A)  The nucleus is the central core of the atom.
B)  The nucleus contains the electrons and the protons.
C)  The nucleus contains most of the mass of the atom.
D)  The nucleus contains the neutrons.
E)  The nucleus contains the neutrons and protons and most of the mass of the atom.F) C) and D)
G) All of the above

Question 7

What do the following have in common? 17Cl-, 18Ar, and 19K+

Accepted Answer

A)  Number of protons
B)  Number of neutrons
C)  They are isotopes.
D)  Number of electrons
E)  They are all ions.F) B) and D)
G) B) and C)

Question 8

To which class does the element chromium belong?

Accepted Answer

A)  representative (main-group)  elements
B)  transition elements
C)  lanthanides
D)  actinides
E)  metalloidsF) B) and E)
G) A) and B)

Question 9

The ions of most main-group elements have the same number of ________ as the noble gas that is closest to them in the periodic table.

Accepted Answer

A)  neutrons
B)  protons
C)  electrons
D)  protons and electrons
E)  neutrons and electronsF) None of the above
G) C) and D)

Question 10

To the correct number of significant figures, the mass of exactly 250 atoms of mercury would be:

Accepted Answer

A)  200.6 amu
B)  250 amu
C)  5.015 x 104 amu
D)  5.0100 x 104 amu
E)  1.246 amuF) B) and C)
G) All of the above

Question 11

The subatomic particles that make up the atom (of interest to chemists)  include all of the following except the:

Accepted Answer

A)  proton.
B)  alpha particle.
C)  electron.
D)  neutron.
E)  alpha particle and neutron.F) B) and E)
G) All of the above

Question 12

Atoms of different isotopes of a given element have the same

Accepted Answer

A)  number of electrons.
B)  sum of the number of protons and neutrons.
C)  sum of the number of electrons and neutrons.
D)  sum of the number of electrons, protons, and neutrons.
E)  mass numbers.F) B) and C)
G) A) and D)

Question 13

Which of the following statements does not apply to metalloids?

Accepted Answer

A)  The physical properties of metalloids resemble those of a metal.
B)  All metalloids are electrical insulators.
C)  Metalloids lie along the stair-step line beginning at boron.
D)  The chemical properties of metalloids are similar to nonmetals.
E)  Metalloids are also known as semi-metals.F) B) and D)
G) A) and C)

Question 14

Sodium reacts vigorously with water to form hydrogen gas and a compound containing sodium ions.Which other element is expected to react with water in a similar way?

Accepted Answer

A)  hydrogen
B)  aluminum
C)  nitrogen
D)  potassium
E)  siliconF) A) and D)
G) A) and E)

Question 15

On the planet Melmac, in a galaxy far, far away, argon has three naturally occurring isotopes as follows: Isotope Mass (amu)  Natural Abundance (%)  Argon-40 39.962 74.20 Argon-38 37.963 15.15 Argon-36 35.968 10.65 What is the relative atomic mass of argon on Melmac?

Accepted Answer

A)  39.23 amu
B)  39.96 amu
C)  37.96 amu
D)  35.97 amu
E)  40.00 amuF) A) and B)
G) All of the above

Question 16

Which of the following statements about Mendeleev's periodic table is incorrect?

Accepted Answer

A)  Mendeleev arranged the known elements in order of increasing relative atomic mass.
B)  He grouped elements with similar properties into columns and rows so that their properties varied in a regular pattern.
C)  He arranged the elements so that they were in increasing atomic number order.
D)  He was able to predict the existence and properties of several elements that were unknown at the time.
E)  Mendeleev developed his table before the discovery of protons.F) A) and D)
G) A) and E)

Question 17

The overall charge of an atom is ________ if the number of electrons is ________ than the number of protons.

Accepted Answer

A)  negative, less
B)  positive, greater
C)  positive, less
D)  neutral, lessE) A) and D)
F) None of the above

Question 18

One balloon is filled with CO2, while the other contains H2.They are filled to equal volumes and contain the same number of molecules.Predict the relative densities of the gases in the two balloons.

Accepted Answer

A)  The CO2 gas should be 44 times the density of the H2 gas.
B)  The CO2 gas should be 22 times the density of the H2 gas.
C)  The CO2 gas should be 1.5 times the density of the H2 gas.
D)  The H2 gas should be 0.67 times the density of the CO2 gas.
E)  The gases should have the same density.F) C) and E)
G) All of the above

Question 19

The mass of exactly 100 carbon atoms is 12.01 amu.

Accepted Answer

A) True 
 B)False

Question 20

The correct isotope symbol for the isotope in the figure is:

Accepted Answer

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

Exam 2: Atoms, Ions, and the Periodic Table

What do the following have in common? 17Cl-, 18Ar, and 19K+

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Sodium reacts vigorously with water to form hydrogen gas and a compound containing sodium ions.Which other element is expected to react with water in a similar way?

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The overall charge of an atom is ________ if the number of electrons is ________ than the number of protons.

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Which of the following statements does not apply to metalloids?

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One balloon is filled with CO2, while the other contains H2.They are filled to equal volumes and contain the same number of molecules.Predict the relative densities of the gases in the two balloons.

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Which of the following statements about Mendeleev's periodic table is incorrect?

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Rutherford's scattering experiment demonstrated

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Which of the following statements regarding the nucleus of the atom is incorrect?

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The mass of exactly 100 carbon atoms is 12.01 amu.

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The subatomic particles that make up the atom (of interest to chemists) include all of the following except the:

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On the planet Melmac, in a galaxy far, far away, argon has three naturally occurring isotopes as follows: Isotope Mass (amu) Natural Abundance (%) Argon-40 39.962 74.20 Argon-38 37.963 15.15 Argon-36 35.968 10.65 What is the relative atomic mass of argon on Melmac?

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To the correct number of significant figures, the mass of exactly 250 atoms of mercury would be:

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Boron has two isotopes: B-10 and B-11, with masses of 10.013 amu and 11.009 amu, respectively.The relative atomic mass of boron is 10.81 amu.Which statement best describes the percent abundance of the isotopes of boron?

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This figure shows a chemical reaction taking place.

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Select the element that is an alkali metal in Period 3.

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Which of the following statements regarding ion formation is incorrect?

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The correct isotope symbol for the isotope in the figure is:

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Atoms of different isotopes of a given element have the same

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To which class does the element chromium belong?

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The ions of most main-group elements have the same number of ________ as the noble gas that is closest to them in the periodic table.

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What do the following have in common? ¹⁷Cl^-, ¹⁸Ar, and ¹⁹K⁺

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The overall charge of an atom is if the number of electrons is than the number of protons.

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One balloon is filled with CO₂, while the other contains H₂.They are filled to equal volumes and contain the same number of molecules.Predict the relative densities of the gases in the two balloons.

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