Question 1

Which of the following is not one of the main features of Dalton's atomic theory?

Accepted Answer

A) Each element is made up of tiny,individual particles called atoms 
B) Atoms are indivisible; they cannot be created or destroyed 
C) Mass differences among atoms of an element are caused by different numbers of neutrons 
D) Atoms of one element are different from atoms of any other element 
E) Atoms of one element may combine with atoms of another element to form chemical compounds 
A) Each element is made up of tiny,individual particles called atoms 
B) Atoms are indivisible; they cannot be created or destroyed 
C) Mass differences among atoms of an element are caused by different numbers of neutrons 
D) Atoms of one element are different from atoms of any other element 
E) Atoms of one element may combine with atoms of another element to form chemical compounds C

Question 2

Which of the three major subatomic particles has/have a mass of approximately 1 u?
(i)e-
(ii)p+
(iii)n0

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 E

Question 3

Which of the following is correct for the fourth period element in Group 3A/13?
Z Chemical symbol Atomic mass

Accepted Answer

A) 31 Ga 69.72 
B) 69.72 Ga 31 
C) 14 Si 28.09 
D) 28.09 Si 14 
E) 21 Sc 44.96 
A) 31 Ga 69.72 
B) 69.72 Ga 31 
C) 14 Si 28.09 
D) 28.09 Si 14 
E) 21 Sc 44.96 A

Question 4

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

Question 5

The nuclear symbol of an isotope of beryllium is   .Indicate the number of protons,number of neutrons,atomic number,and mass number of the isotope.
Number of protons Number of neutrons Atomic number Mass number

Accepted Answer

A) 6 4 10 6 
B) 6 4 10 4 
C) 4 6 4 10 
D) 10 4 6 4 
E) 4 10 4 6 
A) 6 4 10 6 
B) 6 4 10 4 
C) 4 6 4 10 
D) 10 4 6 4 
E) 4 10 4 6

Question 6

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 7

Which of the following is correct for the element with Z = 9?
Symbol Atomic mass Period Group

Accepted Answer

A) F 19.00 2 7A/17 
B) F 19.00 7A/17 2 
C) F 9 2 7A/17 
D) F 9 7A/17 2 
E) Be 9 2 2A/2 
A) F 19.00 2 7A/17 
B) F 19.00 7A/17 2 
C) F 9 2 7A/17 
D) F 9 7A/17 2 
E) Be 9 2 2A/2

Question 8

One of the features of Dalton's atomic theory no longer considered to be correct is: All atoms of each element are identical in every respect.Which of the following is the best explanation of why this feature is no longer considered valid?

Accepted Answer

A) The existence of isotopes 
B) The existence of ions 
C) Natural variation in the mass of the proton 
D) Natural variation in the mass of the neutron 
E) Natural variation in the masses of the proton and the neutron 
A) The existence of isotopes 
B) The existence of ions 
C) Natural variation in the mass of the proton 
D) Natural variation in the mass of the neutron 
E) Natural variation in the masses of the proton and the neutron

Question 9

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 10

Which of the following statements is false?

Accepted Answer

A) The proton and the neutron are primarily responsible for the mass of an atom 
B) The charge on electrons and protons are equal in magnitude but opposite in sign 
C) The mass of a proton and a neutron are approximately the same 
D) The mass of a proton is approximately one gram 
E) A neutron,as its name suggests,is electrically neutral 
A) The proton and the neutron are primarily responsible for the mass of an atom 
B) The charge on electrons and protons are equal in magnitude but opposite in sign 
C) The mass of a proton and a neutron are approximately the same 
D) The mass of a proton is approximately one gram 
E) A neutron,as its name suggests,is electrically neutral

Question 11

Groups in the periodic table are also known as...

Accepted Answer

A) periods 
B) IUPACs 
C) Mendeleevian elements 
D) chemical families 
E) assemblages 
A) periods 
B) IUPACs 
C) Mendeleevian elements 
D) chemical families 
E) assemblages

Question 12

Which of the following is correct for the element with atomic number 20?
Symbol Atomic mass (u)Period Group

Accepted Answer

A) Ca 40.08 2A/2 4 
B) Ca 40.08 4 2A/2 
C) Ca 20 2A/2 4 
D) Ca 20 4 2A/2 
E) Ne 20 2 8A/18 
A) Ca 40.08 2A/2 4 
B) Ca 40.08 4 2A/2 
C) Ca 20 2A/2 4 
D) Ca 20 4 2A/2 
E) Ne 20 2 8A/18

Question 13

Which of the following masses is closest to the mass of one atomic mass unit?

Accepted Answer

A) 12 g 
B) 1.66 g 
C) 1 g 
D) 1/12 g 
E) 10-24 g 
A) 12 g 
B) 1.66 g 
C) 1 g 
D) 1/12 g 
E) 10-24 g

Question 14

Which of the following elements are correctly matched with their period and group?
(i)C
First period
Group 4A/4
(ii)Ne
Second period
Group 8A/18
(iii)Al
Third period
Group 3A/13
(iv)Ca
Third period
Group 2A/2
(v)Br
Fourth period
Group 8A/18

Accepted Answer

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

Question 15

The nuclear symbol of an isotope of potassium is   .Indicate the number of protons,number of neutrons,atomic number,and mass number of the isotope.
Number of protons Number of neutrons Atomic number Mass number

Accepted Answer

A) 19 22 19 41 
B) 22 19 41 19 
C) 19 41 19 22 
D) 41 19 22 19 
E) 41 19 41 22 
A) 19 22 19 41 
B) 22 19 41 19 
C) 19 41 19 22 
D) 41 19 22 19 
E) 41 19 41 22

Question 16

Consider the following model of a generic atom.   Which of the following is correct regarding the "regions" labeled 1 and 2?

Accepted Answer

A) Region 1 contains most of the mass and is negatively charged. 
B) Region 2 contains very little mass and is positively charged. 
C) Region 1 contains most of the mass and is positively charged. 
D) Region 2 contains very little mass and is not charged. 
E) Region 1 contains most of the mass and not charged. 
A) Region 1 contains most of the mass and is negatively charged. 
B) Region 2 contains very little mass and is positively charged. 
C) Region 1 contains most of the mass and is positively charged. 
D) Region 2 contains very little mass and is not charged. 
E) Region 1 contains most of the mass and not charged.

Question 17

Which of the following is a correct statement about the Rutherford scattering experiment?

Accepted Answer

A) The experiment provided an explanation of the discrete lines in atomic spectra 
B) The experiment yielded evidence that electrons are charged particles but neutrons are not electrically charged 
C) The experiment showed that the electrons contain nearly all of the mass of the atom 
D) The experiment provided evidence that matter does not consist of atoms 
E) The experiment indicated that at the center of the atom is a tiny and extremely dense nucleus 
A) The experiment provided an explanation of the discrete lines in atomic spectra 
B) The experiment yielded evidence that electrons are charged particles but neutrons are not electrically charged 
C) The experiment showed that the electrons contain nearly all of the mass of the atom 
D) The experiment provided evidence that matter does not consist of atoms 
E) The experiment indicated that at the center of the atom is a tiny and extremely dense nucleus

Question 18

Calculate the atomic mass of the element having the following distribution of isotopes:
5)8% 53.9396 u
91)8% 55.9349 u
2)1% 56.9354 u
0)3% 57.9333 u

Accepted Answer

A) 51.3 u 
B) 55.8 u 
C) 55.9349 u 
D) 56.2 u 
E) 5.58 * 103 u 
A) 51.3 u 
B) 55.8 u 
C) 55.9349 u 
D) 56.2 u 
E) 5.58 * 103 u

Question 19

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 20

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

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

Which of the following is not one of the main features of Dalton's atomic theory?

Which of the three major subatomic particles has/have a mass of approximately 1 u? (i)e- (ii)p+ (iii)n0

Which of the following is correct for the fourth period element in Group 3A/13? Z Chemical symbol Atomic mass

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?

The nuclear symbol of an isotope of beryllium is .Indicate the number of protons,number of neutrons,atomic number,and mass number of the isotope. Number of protons Number of neutrons Atomic number Mass number

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

Which of the following is correct for the element with Z = 9? Symbol Atomic mass Period Group

One of the features of Dalton's atomic theory no longer considered to be correct is: All atoms of each element are identical in every respect.Which of the following is the best explanation of why this feature is no longer considered valid?

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 is false?

Groups in the periodic table are also known as...

Which of the following is correct for the element with atomic number 20? Symbol Atomic mass (u)Period Group

Which of the following masses is closest to the mass of one atomic mass unit?

Which of the following elements are correctly matched with their period and group? (i)C First period Group 4A/4 (ii)Ne Second period Group 8A/18 (iii)Al Third period Group 3A/13 (iv)Ca Third period Group 2A/2 (v)Br Fourth period Group 8A/18

The nuclear symbol of an isotope of potassium is .Indicate the number of protons,number of neutrons,atomic number,and mass number of the isotope. Number of protons Number of neutrons Atomic number Mass number

Consider the following model of a generic atom. Which of the following is correct regarding the "regions" labeled 1 and 2?

Which of the following is a correct statement about the Rutherford scattering experiment?

Calculate the atomic mass of the element having the following distribution of isotopes: 5)8% 53.9396 u 91)8% 55.9349 u 2)1% 56.9354 u 0)3% 57.9333 u

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

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

Acid-Base Proton-Transferreactions

Chemical Equilibrium

Oxidation-Reduction Redoxreactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Which of the three major subatomic particles has/have a mass of approximately 1 u? (i)e^- (ii)p⁺ (iii)n⁰