Question 1

Examine the block on the periodic table indicated by the arrow.   Which of the following correctly describes this element (V - vanadium)?

Accepted Answer

A) a metal with 25 neutrons in the nucleus. 
B) a transition metal in period 3 group 5. 
C) a transition metal in period 4 with 23 protons 
D) a nonmetal in period 4 group 5 
E) a metal in period 3 group 5 with 23 electrons 
A) a metal with 25 neutrons in the nucleus. 
B) a transition metal in period 3 group 5. 
C) a transition metal in period 4 with 23 protons 
D) a nonmetal in period 4 group 5 
E) a metal in period 3 group 5 with 23 electrons C

Question 2

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 D

Question 3

Which of the following gives the correct number of elements in each of the first six periods in the periodic table?

Accepted Answer

E

Question 4

Groups in the periodic table are also known as...
A)periods
B)IUPACs
C)Mendeleevian elements
D)chemical families
E)assemblages

Accepted Answer

The answer of Groups in the periodic table are also...

Question 5

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 6

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.

Accepted Answer

The answer of The nuclear symbol of an isotope of...

Question 7

The chemical symbol of germanium is Ge.An isotope of this element has 32 protons and 46 neutrons in the nucleus.What are the nuclear symbol,the atomic number,and the mass number of this isotope of germanium?
Nuclear symbol Atomic number Mass number

Accepted Answer

A)    46 32 
B)    78 46 
C)    46 78 
D)    78 32 
E)    32 78 
A)    46 32 
B)    78 46 
C)    46 78 
D)    78 32 
E)    32 78

Question 8

Which of the following is correct?

Accepted Answer

A) The element H is in both the first period and the seventh period 
B) The element Na is in Group 2A/2 
C) The element Ge is in the fourth period and Group 4A/14 
D) The element Cr is in the third period and Group 6B/6 
E) More than one of the statements above are correct 
A) The element H is in both the first period and the seventh period 
B) The element Na is in Group 2A/2 
C) The element Ge is in the fourth period and Group 4A/14 
D) The element Cr is in the third period and Group 6B/6 
E) More than one of the statements above are correct

Question 9

Which of the following symbol/name pairs is/are correctly matched?
i.Fl,Fluorine
ii.N,Neon
iii.S,Sodium
iv.Ch,Chlorine
v.H,Hydrogen

Accepted Answer

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

Question 10

Isotopes of an element vary in mass because of differing numbers of:

Accepted Answer

A) Protons 
B) Neutrons 
C) Electrons 
D) Protons and neutrons 
E) Protons and electrons 
A) Protons 
B) Neutrons 
C) Electrons 
D) Protons and neutrons 
E) Protons and electrons

Question 11

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 12

Which of the following is not a description of atoms according to Dalton's atomic theory?

Accepted Answer

A) Atoms cannot be destroyed or created 
B) Atoms of different elements may combine in the ratio of small, whole numbers to form compounds 
C) Atoms of the same element that have different masses are called isotopes 
D) All atoms of one element have the same mass 
E) Atoms of two different elements have different masses 
A) Atoms cannot be destroyed or created 
B) Atoms of different elements may combine in the ratio of small, whole numbers to form compounds 
C) Atoms of the same element that have different masses are called isotopes 
D) All atoms of one element have the same mass 
E) Atoms of two different elements have different masses

Question 13

Which of the following is the best definition of the atomic mass unit?

Accepted Answer

A) Exactly 1/12 of the mass of a carbon-12 atom 
B) The average mass of the atoms of an element compared to an atom of carbon-12 at exactly 12 u 
C) The total number of protons and neutrons in the nucleus of an atom of carbon-12 
D) Exactly 1/12 of the mass of a carbon-12 nucleus 
E) Exactly 1/12 of the mass of 12 neutrons in a neutral electrical field 
A) Exactly 1/12 of the mass of a carbon-12 atom 
B) The average mass of the atoms of an element compared to an atom of carbon-12 at exactly 12 u 
C) The total number of protons and neutrons in the nucleus of an atom of carbon-12 
D) Exactly 1/12 of the mass of a carbon-12 nucleus 
E) Exactly 1/12 of the mass of 12 neutrons in a neutral electrical field

Question 14

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 15

Consider the following generic picture of an atom.   Which of the following is correct about the regions labeled 1 and 2?

Accepted Answer

A) Region 2 is populated by electrons and neutrons. 
B) Region 2 is populated by electrons an protons. 
C) Region 1 is populated by protons and neutrons. 
D) Region 1 is populated by protons and electrons. 
E) Region 1 is populated only by electrons and Region 2 only by protons. 
A) Region 2 is populated by electrons and neutrons. 
B) Region 2 is populated by electrons an protons. 
C) Region 1 is populated by protons and neutrons. 
D) Region 1 is populated by protons and electrons. 
E) Region 1 is populated only by electrons and Region 2 only by protons.

Question 16

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 17

Dalton's atomic theory explained the observation that the percentage by mass of the elements in a compound is always the same,thus Dalton's atomic theory supports what Law?

Accepted Answer

A) The Law of Definite Composition 
B) The Law of Conservation of Mass 
C) The Law of Conservation of Energy 
D) The Law of Multiple Proportions 
E) The Law of Chemical Compounds 
A) The Law of Definite Composition 
B) The Law of Conservation of Mass 
C) The Law of Conservation of Energy 
D) The Law of Multiple Proportions 
E) The Law of Chemical Compounds

Question 18

​Which of the following is an incorrect statement about the Rutherford scattering experiment?

Accepted Answer

A) ​Most of the alpha particles directed at a very thin gold foil passed right through the foil, undeflected from their straight-line path 
B) ​As a result of the experiment, the atom is pictured as consisting mostly of open space 
C) ​The few alpha particles that were on a collision course with the gold electrons were repelled backward at acute angles 
D) ​The experiment led to the conclusion that the nucleus of an atom contains all of the atom's positive charge 
E) ​The experiment provided a partial understanding of the location and charge of the particles within the atom 
A) ​Most of the alpha particles directed at a very thin gold foil passed right through the foil, undeflected from their straight-line path 
B) ​As a result of the experiment, the atom is pictured as consisting mostly of open space 
C) ​The few alpha particles that were on a collision course with the gold electrons were repelled backward at acute angles 
D) ​The experiment led to the conclusion that the nucleus of an atom contains all of the atom's positive charge 
E) ​The experiment provided a partial understanding of the location and charge of the particles within the atom

Question 19

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

Question 20

Which of the following is the best explanation of why the mass of an atom is usually expressed in atomic mass units rather than grams?

Accepted Answer

A) An atomic mass unit is only used for carbon-12 
B) The mass of one milliliter of water is one gram 
C) The mass in grams is not known for atoms 
D) The mass of an atom in grams is inconveniently small 
E) Metric units such as grams are not applicable to atoms 
A) An atomic mass unit is only used for carbon-12 
B) The mass of one milliliter of water is one gram 
C) The mass in grams is not known for atoms 
D) The mass of an atom in grams is inconveniently small 
E) Metric units such as grams are not applicable to atoms

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

Examine the block on the periodic table indicated by the arrow. Which of the following correctly describes this element (V - vanadium)?

Which of the following statements is false?

Which of the following gives the correct number of elements in each of the first six periods in the periodic table?

Groups in the periodic table are also known as... A)periods B)IUPACs C)Mendeleevian elements D)chemical families E)assemblages

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

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.

The chemical symbol of germanium is Ge.An isotope of this element has 32 protons and 46 neutrons in the nucleus.What are the nuclear symbol,the atomic number,and the mass number of this isotope of germanium? Nuclear symbol Atomic number Mass number

Which of the following is correct?

Which of the following symbol/name pairs is/are correctly matched? i.Fl,Fluorine ii.N,Neon iii.S,Sodium iv.Ch,Chlorine v.H,Hydrogen

Isotopes of an element vary in mass because of differing numbers of:

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 is not a description of atoms according to Dalton's atomic theory?

Which of the following is the best definition of the atomic mass unit?

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

Consider the following generic picture of an atom. Which of the following is correct about the regions labeled 1 and 2?

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

Dalton's atomic theory explained the observation that the percentage by mass of the elements in a compound is always the same,thus Dalton's atomic theory supports what Law?

​Which of the following is an incorrect statement about the Rutherford scattering experiment?

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

Which of the following is the best explanation of why the mass of an atom is usually expressed in atomic mass units rather than grams?

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

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Which of the following is an incorrect statement about the Rutherford scattering experiment?