Question 1

John Dalton reasoned that atoms exist from the evidence that

Accepted Answer

A) there are numerous, tiny empty spaces in matter. 
B) elements always combined in certain fixed ratios. 
C) elements could not be broken down into simpler substances. 
D) matter was homogeneous. 
A) there are numerous, tiny empty spaces in matter. 
B) elements always combined in certain fixed ratios. 
C) elements could not be broken down into simpler substances. 
D) matter was homogeneous. B

Question 2

Photons of which of the following colors of light possess the greatest amount of energy?

Accepted Answer

A) blue 
B) green 
C) yellow 
D) red 
A) blue 
B) green 
C) yellow 
D) red A

Question 3

The atomic number of an element is the number of

Accepted Answer

A) protons. 
B) protons and neutrons. 
C) protons and electrons. 
D) all the particles in the atom. 
A) protons. 
B) protons and neutrons. 
C) protons and electrons. 
D) all the particles in the atom. A

Question 4

The atomic number of an element is the total number of protons and neutrons in the nucleus.

Accepted Answer

A) True 
 B)False

Question 5

According to the quantum mechanical model, electrons exist in

Accepted Answer

A) circular orbits. 
B) elliptical orbits. 
C) orbitals. 
D) wavy orbits. 
A) circular orbits. 
B) elliptical orbits. 
C) orbitals. 
D) wavy orbits.

Question 6

Heisenberg's uncertainty principle says that you cannot know the momentum or the position of an electron exactly.

Accepted Answer

A) True 
 B)False

Question 7

Millikan found that all of the oil droplets in his apparatus carried a charge that was an integer multiple of one particular value.

Accepted Answer

A) True 
 B)False

Question 8

In the Bohr model of the atom, the energy state of an electron could be described with one number.The quantum mechanical model of the atom requires how many numbers to do the same?

Accepted Answer

A) 4 
B) 2 
C) 1 
D) It varies from atom to atom. 
A) 4 
B) 2 
C) 1 
D) It varies from atom to atom.

Question 9

The proposal that matter, like light, exhibits wave-like behavior was

Accepted Answer

A) verified in diffraction experiments with a beam of electrons. 
B) never tested since it was known to be impossible. 
C) shown to be theoretically possible, but never verified by experiment. 
D) verified by physical measurements of a moving baseball. 
A) verified in diffraction experiments with a beam of electrons. 
B) never tested since it was known to be impossible. 
C) shown to be theoretically possible, but never verified by experiment. 
D) verified by physical measurements of a moving baseball.

Question 10

Isotopes of an element are atoms that have

Accepted Answer

A) the same number of protons, but a different number of electron. 
B) the same number of neutrons, but a different number of protons. 
C) the same number of protons, but a different number of neutrons. 
D) equal numbers of protons and neutrons. 
A) the same number of protons, but a different number of electron. 
B) the same number of neutrons, but a different number of protons. 
C) the same number of protons, but a different number of neutrons. 
D) equal numbers of protons and neutrons.

Question 11

Identify the number of protons, neutrons, and electrons in an atom of    
  .

Accepted Answer

A) 9 protons, 10 neutrons, and 9 electrons 
B) 9 protons, 10 neutrons, and 10 electrons 
C) 9 protons, 19 neutrons, and 9 electrons 
D) 10 protons, 9 neutrons, and 10 electrons 
A) 9 protons, 10 neutrons, and 9 electrons 
B) 9 protons, 10 neutrons, and 10 electrons 
C) 9 protons, 19 neutrons, and 9 electrons 
D) 10 protons, 9 neutrons, and 10 electrons

Question 12

Niels Bohr's model of the hydrogen atom

Accepted Answer

A) was controversial because it contradicted accepted principles of physics. 
B) held that electrons existed in allowed orbits and nowhere else. 
C) accounted for the observed spectrum in hydrogen. 
D) All of the above. 
A) was controversial because it contradicted accepted principles of physics. 
B) held that electrons existed in allowed orbits and nowhere else. 
C) accounted for the observed spectrum in hydrogen. 
D) All of the above.

Question 13

The fact that wavelengths of the four lines in the Balmer series fit a regular pattern was evidence supporting the idea that

Accepted Answer

A) electrons could exist in only four energy states in a hydrogen atom. 
B) there must be four electrons in each hydrogen atom. 
C) electrons could only gain or lose specific amounts of energy in hydrogen atoms. 
D) electrons were continuously losing energy. 
A) electrons could exist in only four energy states in a hydrogen atom. 
B) there must be four electrons in each hydrogen atom. 
C) electrons could only gain or lose specific amounts of energy in hydrogen atoms. 
D) electrons were continuously losing energy.

Question 14

When Rutherford found that some of the alpha particles fired at the gold foil were widely deflected, he concluded that

Accepted Answer

A) gold was an element, not a compound as previously believed. 
B) atoms are solid, with spaces between them. 
C) atoms are electrically neutral. 
D) the positive charge in an atom is concentrated in a tiny nucleus. 
A) gold was an element, not a compound as previously believed. 
B) atoms are solid, with spaces between them. 
C) atoms are electrically neutral. 
D) the positive charge in an atom is concentrated in a tiny nucleus.

Question 15

Atoms in an incandescent gas

Accepted Answer

A) emit all frequencies of light in a continuous spectrum. 
B) emit different frequencies of light depending on its temperature. 
C) emit characteristic frequencies of light. 
D) absorb, rather than emit light. 
A) emit all frequencies of light in a continuous spectrum. 
B) emit different frequencies of light depending on its temperature. 
C) emit characteristic frequencies of light. 
D) absorb, rather than emit light.

Question 16

Einstein proposed that electrons on the surface of a metal gradually absorb energy from photons until they have enough energy to leave the surface.

Accepted Answer

A) True 
 B)False

Question 17

Neutral atoms of a given element all have the same

Accepted Answer

A) number of protons. 
B) atomic number. 
C) number of electrons. 
D) All of the above. 
A) number of protons. 
B) atomic number. 
C) number of electrons. 
D) All of the above.

Question 18

J.J.Thomson reasoned that cathode rays were really charged particles because

Accepted Answer

A) a magnet deflected cathode rays. 
B) cathode rays formed only when the air was pumped out of a discharge tube. 
C) the properties of the cathode rays depended on the cathode material. 
D) the cathode rays were attracted to the anode. 
A) a magnet deflected cathode rays. 
B) cathode rays formed only when the air was pumped out of a discharge tube. 
C) the properties of the cathode rays depended on the cathode material. 
D) the cathode rays were attracted to the anode.

Question 19

Protons are so much more massive than electrons that you can neglect the mass of electrons when determining the mass of an atom.

Accepted Answer

A) True 
 B)False

Question 20

The quantum mechanical model of the atom differs from the Bohr model in that it

Accepted Answer

A) considers the electron as a particle. 
B) considers the electron as a wave. 
C) predicts the specific location of the electron in an atom. 
D) states that electrons can only exist at specific distances from the nucleus. 
A) considers the electron as a particle. 
B) considers the electron as a wave. 
C) predicts the specific location of the electron in an atom. 
D) states that electrons can only exist at specific distances from the nucleus.

Exam 8: Atoms and Periodic Properties

John Dalton reasoned that atoms exist from the evidence that

Photons of which of the following colors of light possess the greatest amount of energy?

The atomic number of an element is the number of

The atomic number of an element is the total number of protons and neutrons in the nucleus.

According to the quantum mechanical model, electrons exist in

Heisenberg's uncertainty principle says that you cannot know the momentum or the position of an electron exactly.

Millikan found that all of the oil droplets in his apparatus carried a charge that was an integer multiple of one particular value.

In the Bohr model of the atom, the energy state of an electron could be described with one number.The quantum mechanical model of the atom requires how many numbers to do the same?

The proposal that matter, like light, exhibits wave-like behavior was

Isotopes of an element are atoms that have

Identify the number of protons, neutrons, and electrons in an atom of .

Niels Bohr's model of the hydrogen atom

The fact that wavelengths of the four lines in the Balmer series fit a regular pattern was evidence supporting the idea that

When Rutherford found that some of the alpha particles fired at the gold foil were widely deflected, he concluded that

Atoms in an incandescent gas

Einstein proposed that electrons on the surface of a metal gradually absorb energy from photons until they have enough energy to leave the surface.

Neutral atoms of a given element all have the same

J.J.Thomson reasoned that cathode rays were really charged particles because

Protons are so much more massive than electrons that you can neglect the mass of electrons when determining the mass of an atom.

The quantum mechanical model of the atom differs from the Bohr model in that it

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