Question 1

Which of the following statements is false?

Accepted Answer

A) The atomic spectrum of helium is different from the atomic spectrum of neon. 
B) Electromagnetic radiation often behaves like a wave. 
C) An atomic spectrum is an element's fingerprint. 
D) An atom emits electromagnetic radiation when an electron moves from a lower energy level to a higher energy level. 
E) Light that is high in energy has a high frequency. 
A) The atomic spectrum of helium is different from the atomic spectrum of neon. 
B) Electromagnetic radiation often behaves like a wave. 
C) An atomic spectrum is an element's fingerprint. 
D) An atom emits electromagnetic radiation when an electron moves from a lower energy level to a higher energy level. 
E) Light that is high in energy has a high frequency.

Question 2

Boron has primarily two isotopes, one with an atomic mass of 11.0 amu and another with an atomic mass of 10.0 amu. If the abundance of the boron atom with a mass of 11.0 amu is 18.9 percent and the abundance of the other isotope is 81.1 percent, what would be the average mass of the boron atom?

Accepted Answer

A) 10.2 amu 
B) 11.0 amu 
C) 10.0 amu 
D) 10.8 amu 
E) not enough information given 
A) 10.2 amu 
B) 11.0 amu 
C) 10.0 amu 
D) 10.8 amu 
E) not enough information given

Question 3

An element found in another galaxy exists as two isotopes. If 80.0 percent of the atoms have an atomic mass of 80.00 amu and the other 20.0 percent have an atomic mass of 82.00 amu, what is the atomic mass of the element?

Accepted Answer

A) 81.0 amu 
B) 64.0 amu 
C) 80.4 amu 
D) 16.4 amu 
E) 81.6 amu 
A) 81.0 amu 
B) 64.0 amu 
C) 80.4 amu 
D) 16.4 amu 
E) 81.6 amu

Question 4

Which of the following statements describes an isotope?

Accepted Answer

A) element with the same number of protons but a different number of neutrons 
B) element with the same number of protons but a different number of electrons 
C) element with the same number of neutrons but a different number of electrons 
D) element with the same number of neutrons but a different number of protons 
E) none of the above 
A) element with the same number of protons but a different number of neutrons 
B) element with the same number of protons but a different number of electrons 
C) element with the same number of neutrons but a different number of electrons 
D) element with the same number of neutrons but a different number of protons 
E) none of the above

Question 5

What color do you see when you close your eyes while in a dark room? Explain.

Accepted Answer

A) dark violet; Since no light is entering, you would tend to see the fringes of color from the ultra-violet region of the spectrum. 
B) flashes of white; Although white is not really a color, you perceive all the frequencies of the spectrum as they flash by the retina of the eye. 
C) black; Since no light is hitting the eye all you see is the absence of color, known as black. 
D) all colors; The harder you close your eyes the more colors you will see. 
A) dark violet; Since no light is entering, you would tend to see the fringes of color from the ultra-violet region of the spectrum. 
B) flashes of white; Although white is not really a color, you perceive all the frequencies of the spectrum as they flash by the retina of the eye. 
C) black; Since no light is hitting the eye all you see is the absence of color, known as black. 
D) all colors; The harder you close your eyes the more colors you will see.

Question 6

What does the following element description actually mean? iron-57

Accepted Answer

A) iron with a mass number of 57 
B) iron with an atomic number of 57 
C) iron with 57 protons 
D) iron with 57 neutrons 
E) 57 iron atoms 
A) iron with a mass number of 57 
B) iron with an atomic number of 57 
C) iron with 57 protons 
D) iron with 57 neutrons 
E) 57 iron atoms

Question 7

Which has more atoms: a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13?

Accepted Answer

A) More information is needed. 
B) a 1-gram sample of carbon-12 
C) a 1-gram sample of carbon-13 
D) They have the same number of atoms. 
A) More information is needed. 
B) a 1-gram sample of carbon-12 
C) a 1-gram sample of carbon-13 
D) They have the same number of atoms.

Question 8

Each atomic orbital can hold ________.

Accepted Answer

A) 1 electron 
B) up to 2 electrons 
C) up to 3 electrons 
D) up to 4 electrons 
A) 1 electron 
B) up to 2 electrons 
C) up to 3 electrons 
D) up to 4 electrons

Question 9

Which of the following gases would diffuse the fastest through an extremely fine membrane?

Accepted Answer

A) He 
B) Ne 
C) Ar 
D) Xe 
E) All of the above would diffuse at the same rate. 
A) He 
B) Ne 
C) Ar 
D) Xe 
E) All of the above would diffuse at the same rate.

Question 10

It is relatively easy to pull an electron away from a potassium atom (K, atomic number 19), but very difficult to remove a second one because ________.

Accepted Answer

A) of the repulsions occurring between electrons within the same shell 
B) the electrons are so very small 
C) of a much greater effective nuclear charge 
D) very little energy remains after the first electron is removed 
A) of the repulsions occurring between electrons within the same shell 
B) the electrons are so very small 
C) of a much greater effective nuclear charge 
D) very little energy remains after the first electron is removed

Question 11

What do the electron configurations for all the group 18 noble gases have in common?

Accepted Answer

A) They have the same number of electrons. 
B) They occupy the same number of shells. 
C) Their outermost occupied shells are filled to capacity. 
D) all of the above 
A) They have the same number of electrons. 
B) They occupy the same number of shells. 
C) Their outermost occupied shells are filled to capacity. 
D) all of the above

Question 12

Which of the following atoms is the largest?

Accepted Answer

A) Cs 
B) Ba 
C) Al 
D) N 
E) He 
A) Cs 
B) Ba 
C) Al 
D) N 
E) He

Question 13

What is a probability cloud?

Accepted Answer

A) It is a three-dimensional map of the likelihood of finding something within a given area. 
B) It is a map of the likelihood of finding an electron within the nucleus. 
C) It is a map of the likelihood of finding a particular proton within the nucleus. 
D) It is a map of the likelihood of a photon ejecting an electron from an atom. 
E) none of the above 
A) It is a three-dimensional map of the likelihood of finding something within a given area. 
B) It is a map of the likelihood of finding an electron within the nucleus. 
C) It is a map of the likelihood of finding a particular proton within the nucleus. 
D) It is a map of the likelihood of a photon ejecting an electron from an atom. 
E) none of the above

Question 14

Which of the following diagrams best represents the size of the atomic nucleus relative to the size of the atom?   A B C D

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 15

What prompted early scientists to propose that the ray of the cathode ray tube was actually a negatively charged particle?

Accepted Answer

A) The ray was present regardless of gas, or even without a gas. 
B) The ray was attracted to positively charge electric plates. 
C) The ray was not seen from the positively charged anode. 
D) The ray could be diverted by a magnetic field. 
E) The ray would change colors depending on which gas was used inside the tube. 
A) The ray was present regardless of gas, or even without a gas. 
B) The ray was attracted to positively charge electric plates. 
C) The ray was not seen from the positively charged anode. 
D) The ray could be diverted by a magnetic field. 
E) The ray would change colors depending on which gas was used inside the tube.

Question 16

The following statement describes which subatomic particle best? It is a nucleon.

Accepted Answer

A) an electron 
B) a proton 
C) a neutron 
D) A and B 
E) B and C 
A) an electron 
B) a proton 
C) a neutron 
D) A and B 
E) B and C

Question 17

The isotope lithium-7 has a mass of 7.0160 atomic mass units, and the isotope lithium-6 has a mass of 6.0151 atomic mass units. Given the information that 92.58 percent of all lithium atoms found in nature are lithium-7 and 7.42 percent are lithium-6, calculate the atomic mass of lithium, Li (atomic number 3).

Accepted Answer

A) 7.0160 amu 
B) 6.942 amu 
C) 6.495 amu 
D) 13.031 amu 
A) 7.0160 amu 
B) 6.942 amu 
C) 6.495 amu 
D) 13.031 amu

Question 18

Neon, Ne, (number 10)has a relatively large effective nuclear charge, yet it cannot attract any additional electrons because ________.

Accepted Answer

A) of the repulsion of neighboring electrons 
B) the outermost shell has gotten too small 
C) the outermost shell is too far away from the nucleus 
D) its outermost shell is already filled to capacity 
A) of the repulsion of neighboring electrons 
B) the outermost shell has gotten too small 
C) the outermost shell is too far away from the nucleus 
D) its outermost shell is already filled to capacity

Question 19

Which of the following best describes a conceptual model of an atom?

Accepted Answer

A) a model that illustrates the tendency of an atom to undergo radioactive decay and the products it produces 
B) a model that illustrates the physical structure of the atom 
C) a model that represents the shape of the nucleus and the location of the electrons 
D) a description of the location of the neutrons and protons in an atom 
E) none of the above 
A) a model that illustrates the tendency of an atom to undergo radioactive decay and the products it produces 
B) a model that illustrates the physical structure of the atom 
C) a model that represents the shape of the nucleus and the location of the electrons 
D) a description of the location of the neutrons and protons in an atom 
E) none of the above

Question 20

The following statement describes which subatomic particle best? It has a relatively large mass.

Accepted Answer

A) an electron 
B) a proton 
C) a neutron 
D) A and B 
E) B and C 
A) an electron 
B) a proton 
C) a neutron 
D) A and B 
E) B and C

Which of the following statements is false?

Boron has primarily two isotopes, one with an atomic mass of 11.0 amu and another with an atomic mass of 10.0 amu. If the abundance of the boron atom with a mass of 11.0 amu is 18.9 percent and the abundance of the other isotope is 81.1 percent, what would be the average mass of the boron atom?

An element found in another galaxy exists as two isotopes. If 80.0 percent of the atoms have an atomic mass of 80.00 amu and the other 20.0 percent have an atomic mass of 82.00 amu, what is the atomic mass of the element?

Which of the following statements describes an isotope?

What color do you see when you close your eyes while in a dark room? Explain.

What does the following element description actually mean? iron-57

Which has more atoms: a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13?

Each atomic orbital can hold ________.

Which of the following gases would diffuse the fastest through an extremely fine membrane?

It is relatively easy to pull an electron away from a potassium atom (K, atomic number 19), but very difficult to remove a second one because ________.

What do the electron configurations for all the group 18 noble gases have in common?

Which of the following atoms is the largest?

What is a probability cloud?

Which of the following diagrams best represents the size of the atomic nucleus relative to the size of the atom? A B C D

What prompted early scientists to propose that the ray of the cathode ray tube was actually a negatively charged particle?

The following statement describes which subatomic particle best? It is a nucleon.

Neon, Ne, (number 10)has a relatively large effective nuclear charge, yet it cannot attract any additional electrons because ________.

Which of the following best describes a conceptual model of an atom?

The following statement describes which subatomic particle best? It has a relatively large mass.

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Exam 4: Subatomic Particles

Which of the following statements is false?

Boron has primarily two isotopes, one with an atomic mass of 11.0 amu and another with an atomic mass of 10.0 amu. If the abundance of the boron atom with a mass of 11.0 amu is 18.9 percent and the abundance of the other isotope is 81.1 percent, what would be the average mass of the boron atom?

An element found in another galaxy exists as two isotopes. If 80.0 percent of the atoms have an atomic mass of 80.00 amu and the other 20.0 percent have an atomic mass of 82.00 amu, what is the atomic mass of the element?

Which of the following statements describes an isotope?

What color do you see when you close your eyes while in a dark room? Explain.

What does the following element description actually mean? iron-57

Which has more atoms: a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13?

Each atomic orbital can hold ________.

Which of the following gases would diffuse the fastest through an extremely fine membrane?

It is relatively easy to pull an electron away from a potassium atom (K, atomic number 19), but very difficult to remove a second one because ________.

What do the electron configurations for all the group 18 noble gases have in common?

Which of the following atoms is the largest?

What is a probability cloud?

Which of the following diagrams best represents the size of the atomic nucleus relative to the size of the atom? A B C D

What prompted early scientists to propose that the ray of the cathode ray tube was actually a negatively charged particle?

The following statement describes which subatomic particle best? It is a nucleon.

Neon, Ne, (number 10)has a relatively large effective nuclear charge, yet it cannot attract any additional electrons because ________.

Which of the following best describes a conceptual model of an atom?

The following statement describes which subatomic particle best? It has a relatively large mass.

About Science

Particles of Matter

Elements of Chemistry

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters