Question 1

Which of the following is correct for the second period element in Group 5A/15?

Accepted Answer

The answer of Which of the following is correct for...

Question 2

Which of the following statements is/are false?
i.Groups are arranged vertically in the periodic table
ii.Periods are arranged horizontally in the periodic table
iii.Periods are numbered from top to bottom
iv.There are eight elements in the first period of the periodic table

Accepted Answer

A) i only 
B) ii and iii 
C) i and ii 
D) iv only 
E) i, ii, and iv 
A) i only 
B) ii and iii 
C) i and ii 
D) iv only 
E) i, ii, and iv

Question 3

Which of the following statements about isotopes is/are correct?
i.They have different masses
ii.They have different numbers of neutrons
iii.They have different electrical charges
iv.They have different nuclear symbols
v.They have different mass numbers

Accepted Answer

A) i and ii 
B) i, ii, and iv 
C) i, ii, and v 
D) i, ii, iv, and v 
E) All are correct 
A) i and ii 
B) i, ii, and iv 
C) i, ii, and v 
D) i, ii, iv, and v 
E) All are correct

Question 4

The chemical symbol of argon is Ar.An isotope of this element has an atomic number of 18 and a mass number of 38.What are the nuclear symbol,the number of protons,and the number of neutrons of this isotope of argon?
Nuclear symbol Number of protons Number of neutrons

Accepted Answer

A)    18 38 
B)    20 18 
C)    38 18 
D)    18 38 
E)    18 20 
A)    18 38 
B)    20 18 
C)    38 18 
D)    18 38 
E)    18 20

Question 5

Two natural isotopes exist for silver.51.83% of the atoms have a mass of 106.90509 u,and the remaining fraction has a mass of 108.9047 u.Calculate the atomic mass of silver.

Accepted Answer

A) 52.46 u 
B) 55.41 u 
C) 106.90509 u 
D) 107.87 u 
E) 108.9047 u 
A) 52.46 u 
B) 55.41 u 
C) 106.90509 u 
D) 107.87 u 
E) 108.9047 u

Question 6

Consider the following pictorial representation of the postulates of Dalton's atomic theory.   Which of the following is the best illustrates of the law of multiple proportions?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) None of these illustrate the law of multiple proportions. 
A) A 
B) B 
C) C 
D) D 
E) None of these illustrate the law of multiple proportions.

Question 7

Which of the three major subatomic particles has/have a charge of -1?
i.electron
ii.proton
iii.neutron

Accepted Answer

A) i only 
B) ii only 
C) iii only 
D) i and ii 
E) ii and iii 
A) i only 
B) ii only 
C) iii only 
D) i and ii 
E) ii and iii

Question 8

One of the main features of Dalton's atomic theory no longer considered valid is: atoms cannot be created or destroyed.Which of the following is the best explanation of why this feature is no longer considered valid?

Accepted Answer

A) The percentage by mass of the elements in a compound is always the same 
B) In a chemical change, mass is neither created or destroyed 
C) Every atom contains an extremely small, extremely dense nucleus 
D) When two elements combine to form more than one compound, the different weights of one element that combine with the same weight of the other element are in a simple ratio of whole numbers 
E) The discovery of subatomic particles 
A) The percentage by mass of the elements in a compound is always the same 
B) In a chemical change, mass is neither created or destroyed 
C) Every atom contains an extremely small, extremely dense nucleus 
D) When two elements combine to form more than one compound, the different weights of one element that combine with the same weight of the other element are in a simple ratio of whole numbers 
E) The discovery of subatomic particles

Which of the following is correct for the second period element in Group 5A/15?

Which of the following statements is/are false? i.Groups are arranged vertically in the periodic table ii.Periods are arranged horizontally in the periodic table iii.Periods are numbered from top to bottom iv.There are eight elements in the first period of the periodic table

Which of the following statements about isotopes is/are correct? i.They have different masses ii.They have different numbers of neutrons iii.They have different electrical charges iv.They have different nuclear symbols v.They have different mass numbers

The chemical symbol of argon is Ar.An isotope of this element has an atomic number of 18 and a mass number of 38.What are the nuclear symbol,the number of protons,and the number of neutrons of this isotope of argon? Nuclear symbol Number of protons Number of neutrons

Two natural isotopes exist for silver.51.83% of the atoms have a mass of 106.90509 u,and the remaining fraction has a mass of 108.9047 u.Calculate the atomic mass of silver.

Consider the following pictorial representation of the postulates of Dalton's atomic theory. Which of the following is the best illustrates of the law of multiple proportions?

Which of the three major subatomic particles has/have a charge of -1? i.electron ii.proton iii.neutron

One of the main features of Dalton's atomic theory no longer considered valid is: atoms cannot be created or destroyed.Which of the following is the best explanation of why this feature is no longer considered valid?

Matter and Energy

Measurement and Chemical Calculations

Introduction to Gases

Chemical Nomenclature

Chemical Formula Relationships

Chemical Reactions

Chemical Change

Quantity Relationships in Chemical Reactions

Atomic Theory: The Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

Gases, Liquids, and Solids

Solutions

Acidbase Proton Transferreactions

Chemical Equilibrium

Oxidationreduction Electron Transferreactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

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Exam 5: Atomic Theory: The Nuclear Model of the Atom

Which of the following is correct for the second period element in Group 5A/15?

Which of the following statements is/are false? i.Groups are arranged vertically in the periodic table ii.Periods are arranged horizontally in the periodic table iii.Periods are numbered from top to bottom iv.There are eight elements in the first period of the periodic table

Which of the following statements about isotopes is/are correct? i.They have different masses ii.They have different numbers of neutrons iii.They have different electrical charges iv.They have different nuclear symbols v.They have different mass numbers

The chemical symbol of argon is Ar.An isotope of this element has an atomic number of 18 and a mass number of 38.What are the nuclear symbol,the number of protons,and the number of neutrons of this isotope of argon? Nuclear symbol Number of protons Number of neutrons

Two natural isotopes exist for silver.51.83% of the atoms have a mass of 106.90509 u,and the remaining fraction has a mass of 108.9047 u.Calculate the atomic mass of silver.

Consider the following pictorial representation of the postulates of Dalton's atomic theory. Which of the following is the best illustrates of the law of multiple proportions?

Which of the three major subatomic particles has/have a charge of -1? i.electron ii.proton iii.neutron

One of the main features of Dalton's atomic theory no longer considered valid is: atoms cannot be created or destroyed.Which of the following is the best explanation of why this feature is no longer considered valid?

Matter and Energy

Measurement and Chemical Calculations

Introduction to Gases

Chemical Nomenclature

Chemical Formula Relationships

Chemical Reactions

Chemical Change

Quantity Relationships in Chemical Reactions

Atomic Theory: The Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

Gases, Liquids, and Solids

Solutions

Acidbase Proton Transferreactions

Chemical Equilibrium

Oxidationreduction Electron Transferreactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters