Question 1

Which statement below accurately describes the contributions of Dalton?

Accepted Answer

A)  ancient Greek philosopher who proposed that matter was continuous
B)  created the modern periodic table
C)  proposed the modern Atomic Theory
D)  discovered the existence of electrons
E)  none of the above

Question 2

John Dalton was the first person recorded as thinking that matter was ultimately composed of atoms.

Accepted Answer

A) True 
 B)False

Question 3

A fictional element has two isotopes,each making up 50% of the population.Isotope 1 has a mass of 80.0 amu,Isotope 2 has a mass of 85.0 amu.Calculate the atomic mass of the fictional element.

Accepted Answer

A)  82.5 amu
B)  42.5 amu
C)  40 amu
D)  165 amu
E)  none of the above

Question 4

All elements have three or more naturally occurring isotopes.

Accepted Answer

A) True 
 B)False

Question 5

John Dalton formalized an atomic theory that gained acceptance in the early 19th century.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following statements about the nature of electrical charge is FALSE?

Accepted Answer

A)  Electrical charge is a fundamental property of protons and electrons.
B)  Positive and negative electrical charges attract each other.
C)  Positive-positive or negative-negative charges repel each other.
D)  Positive and negative charges cancel each other so that a proton and electron,when paired,are charge neutral.
E)  All of the above statements are true.

Question 7

J.J.Thomson discovered the existence of protons.

Accepted Answer

A) True 
 B)False

Question 8

An atom that has the same number of neutrons as  Ba is:

Accepted Answer

A)    Cs
B)    Ba
C)    La
D)    Xe
E)  none of the above

Question 9

Which one of the following is a main-group element?

Accepted Answer

A)  Ce
B)  Co
C)  Cu
D)  Cs
E)  none of the above

Question 10

Which statement below is NOT consistent with the nuclear theory of the atom as proposed by Rutherford?

Accepted Answer

A)  Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus.
B)  Electrical charge is a fundamental property of protons and electrons in which like charges repel and opposite charges attract.
C)  Most of the volume of the atom is empty space occupied by tiny,negatively charged electrons.
D)  There are as many electrons outside the nucleus as there are protons inside the nucleus in a neutral atom.
E)  All of the above statements are consistent.

Question 11

A specific isotope of an element is known to have 15 protons and 16 neutrons.Which symbol would properly represent this isotope?

Accepted Answer

A)    Ga
B)    P
C)    X
D)    S
E)  none of the above

Question 12

Main-group elements tend to form ions that have the same number of total electrons as the nearest halogen.

Accepted Answer

A) True 
 B)False  False

Question 13

What is the atomic symbol for silver?

Accepted Answer

A)  S
B)  Ag
C)  Au
D)  Si
E)  none of the above

Question 14

Aluminum is one of the most commonly used metalloids.

Accepted Answer

A) True 
 B)False  False

Question 15

All of the following statements about different elements are true EXCEPT:

Accepted Answer

A)  Barium is an alkaline earth metal.
B)  Manganese is a transition metal.
C)  Sulfur is considered a metalloid.
D)  Krypton is one of the noble gases.
E)  Iodine is a halogen. C

Question 16

The gold foil experiment proved that large regions of the atoms consisted of empty space.

Accepted Answer

A) True 
 B)False

Question 17

The only known atom that does not contain a neutron is one of the isotopes of hydrogen.The mass number,symbolized as "A" in the text,of this hydrogen isotope must be:

Accepted Answer

A)  1.01
B)  0
C)  1
D)  2
E)  none of the above

Question 18

The charges on electrons and neutrons cancel each other to give neutral atoms.

Accepted Answer

A) True 
 B)False

Question 19

How many electrons are in Br-?

Accepted Answer

A)  4
B)  7
C)  34
D)  36
E)  none of the above

Question 20

The smell of the ocean is caused by atoms.

Accepted Answer

A) True 
 B)False

Exam 4: Atoms and Elements

Which statement below accurately describes the contributions of Dalton?

Correct AnswerverifiedShow Answer

John Dalton was the first person recorded as thinking that matter was ultimately composed of atoms.

Correct AnswerverifiedShow Answer

A fictional element has two isotopes,each making up 50% of the population.Isotope 1 has a mass of 80.0 amu,Isotope 2 has a mass of 85.0 amu.Calculate the atomic mass of the fictional element.

Correct AnswerverifiedShow Answer

All elements have three or more naturally occurring isotopes.

Correct AnswerverifiedShow Answer

John Dalton formalized an atomic theory that gained acceptance in the early 19th century.

Correct AnswerverifiedShow Answer

Which of the following statements about the nature of electrical charge is FALSE?

Correct AnswerverifiedShow Answer

J.J.Thomson discovered the existence of protons.

Correct AnswerverifiedShow Answer

An atom that has the same number of neutrons as Ba is:

Correct AnswerverifiedShow Answer

Which one of the following is a main-group element?

Correct AnswerverifiedShow Answer

Which statement below is NOT consistent with the nuclear theory of the atom as proposed by Rutherford?

Correct AnswerverifiedShow Answer

A specific isotope of an element is known to have 15 protons and 16 neutrons.Which symbol would properly represent this isotope?

Correct AnswerverifiedShow Answer

Main-group elements tend to form ions that have the same number of total electrons as the nearest halogen.

Correct AnswerverifiedFalse

What is the atomic symbol for silver?

Correct AnswerverifiedShow Answer

Aluminum is one of the most commonly used metalloids.

Correct AnswerverifiedFalse

All of the following statements about different elements are true EXCEPT:

Correct AnswerverifiedC

The gold foil experiment proved that large regions of the atoms consisted of empty space.

Correct AnswerverifiedShow Answer

The only known atom that does not contain a neutron is one of the isotopes of hydrogen.The mass number,symbolized as "A" in the text,of this hydrogen isotope must be:

Correct AnswerverifiedShow Answer

The charges on electrons and neutrons cancel each other to give neutral atoms.

Correct AnswerverifiedShow Answer

How many electrons are in Br-?

Correct AnswerverifiedShow Answer

The smell of the ocean is caused by atoms.

Correct AnswerverifiedShow Answer

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False

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False

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C

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How many electrons are in Br^-?

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