Question 1

Explain how the term "valence electrons" is related to electron configurations.Use the elements in group VI,Periods,3,4,and 5,as examples.

Accepted Answer

The electron configuration allows us to

Question 2

An imaginary element Xz consists of two isotopes having masses of 100.0 amu and 102.0 amu.A sample of Xz was found to contain 75.0% of the 100Xz isotope and 25.0% of the 102Xz.Calculate the atomic weight of Xz.

Accepted Answer

A) 100.3 amu 
B) 100.5 amu 
C) 101.0 amu 
D) 101.5 amu 
E) 101.8 amu 
A) 100.3 amu 
B) 100.5 amu 
C) 101.0 amu 
D) 101.5 amu 
E) 101.8 amu

Question 3

Which of the following elements is a noble gas?

Accepted Answer

A) Cl 
B) H 
C) N 
D) Ne 
E) O 
A) Cl 
B) H 
C) N 
D) Ne 
E) O

Question 4

How many electrons are there in the valence shell of a nitrogen atom?

Accepted Answer

A) 0 
B) 2 
C) 3 
D) 5 
E) 7 
A) 0 
B) 2 
C) 3 
D) 5 
E) 7

Question 5

An s-block element in the 5th Period is

Accepted Answer

A) Y. 
B) As. 
C) Sr. 
D) Mo. 
E) Ag. 
A) Y. 
B) As. 
C) Sr. 
D) Mo. 
E) Ag.

Question 6

In terms of atomic structure,the common characteristic of elements in the same group is

Accepted Answer

A) number of electrons. 
B) number of electrons in the outermost shell. 
C) number of neutrons. 
D) number of protons. 
E) none of the above 
A) number of electrons. 
B) number of electrons in the outermost shell. 
C) number of neutrons. 
D) number of protons. 
E) none of the above

Question 7

Which column of the periodic table contains only nonmetals?

Accepted Answer

A) 4A 
B) 5A 
C) 6A 
D) 7A 
A) 4A 
B) 5A 
C) 6A 
D) 7A

Question 8

The number of valence electrons in an element with electron configuration
1s2 2s2 2p6 3s2 3p4 is ________.

Accepted Answer

A) 2 
B) 4 
C) 6 
D) 8 
E) 16 
A) 2 
B) 4 
C) 6 
D) 8 
E) 16

Question 9

What is the electron configuration of S?

Accepted Answer

A) 1s2 2s2 2p2 
B) 1s2 2s2 2p6 3s2 3p2 
C) 1s2 2s2 2p6 3s2 3p4 
D) 1s2 2s2 2p6 3s2 3p6 
E) 1s2 2s2 2p6 3s2 3p6 4s2 3d1 
A) 1s2 2s2 2p2 
B) 1s2 2s2 2p6 3s2 3p2 
C) 1s2 2s2 2p6 3s2 3p4 
D) 1s2 2s2 2p6 3s2 3p6 
E) 1s2 2s2 2p6 3s2 3p6 4s2 3d1

Question 10

Which characteristics correctly describe an electron?

Accepted Answer

A) approximate mass 1 amu; charge +1; inside nucleus 
B) approximate mass 1 amu; charge -1; inside nucleus 
C) approximate mass 1 amu; charge 0; inside nucleus 
D) approximate mass 5 × 10-4 amu; charge 0; inside nucleus 
E) approximate mass 5 × 10-4 amu; charge -1; outside nucleus 
A) approximate mass 1 amu; charge +1; inside nucleus 
B) approximate mass 1 amu; charge -1; inside nucleus 
C) approximate mass 1 amu; charge 0; inside nucleus 
D) approximate mass 5 × 10-4 amu; charge 0; inside nucleus 
E) approximate mass 5 × 10-4 amu; charge -1; outside nucleus

Question 11

What is the maximum number of electrons that can occupy the 4f orbitals?

Accepted Answer

A) 2 
B) 6 
C) 8 
D) 10 
E) 14 
A) 2 
B) 6 
C) 8 
D) 10 
E) 14

Question 12

The shell having n = 3 contains ________ subshells,________ orbitals,and up to ________ electrons

Accepted Answer

A) 2,4,8 
B) 3,6,12 
C) 3,6,18 
D) 3,9,18 
E) 3,12,36 
A) 2,4,8 
B) 3,6,12 
C) 3,6,18 
D) 3,9,18 
E) 3,12,36

Question 13

An imaginary element Xq consists of two isotopes having masses of 100.0 amu and 102.0 amu.A sample of Xq was found to contain 20.0% of the 100Xq isotope and 80.0% of the 102Xq.Calculate the atomic weight of Xq.

Accepted Answer

A) 100.2 amu 
B) 100.4 amu 
C) 101.0 amu 
D) 101.6 amu 
E) 202.0 amu 
A) 100.2 amu 
B) 100.4 amu 
C) 101.0 amu 
D) 101.6 amu 
E) 202.0 amu

Question 14

An atom containing 29 protons,29 electrons,and 34 neutrons has a mass number of

Accepted Answer

A) 5. 
B) 29. 
C) 34. 
D) 58. 
E) 63. 
A) 5. 
B) 29. 
C) 34. 
D) 58. 
E) 63.

Question 15

Naturally occurring iron contains 5.82% 54Fe,91.66 % 56Fe,2.19% 57Fe,and 0.33% 58Fe.The respective atomic masses are 53.940 amu,55.935 amu,56.935 amu,and 57.933 amu.Calculate the average atomic mass of iron.

Accepted Answer

Question 16

The value for A for an atom containing 47 protons,47 electrons,and 60 neutrons is

Accepted Answer

A) 13. 
B) 47. 
C) 60. 
D) 107. 
E) 154. 
A) 13. 
B) 47. 
C) 60. 
D) 107. 
E) 154.

Question 17

The value of A for an atom containing 29 protons,29 electrons,and 34 neutrons is

Accepted Answer

A) 5. 
B) 29. 
C) 34. 
D) 58. 
E) 63. 
A) 5. 
B) 29. 
C) 34. 
D) 58. 
E) 63.

Question 18

The element which has four valence electrons is ________.

Accepted Answer

A) H 
B) Na 
C) Mg 
D) Si 
E) S 
A) H 
B) Na 
C) Mg 
D) Si 
E) S

Question 19

Which element is most likely to have chemical properties similar to those of potassium (atomic number 19)?

Accepted Answer

A) Ar (atomic number 18) 
B) Ca (atomic number 20) 
C) Sc (atomic number 21) 
D) Rb (atomic number 37) 
E) Sr (atomic number 38) 
A) Ar (atomic number 18) 
B) Ca (atomic number 20) 
C) Sc (atomic number 21) 
D) Rb (atomic number 37) 
E) Sr (atomic number 38)

Question 20

Transition metals can also be called

Accepted Answer

A) s-block elements. 
B) p-block elements. 
C) d-block elements. 
D) f-block elements. 
E) precious metals. 
A) s-block elements. 
B) p-block elements. 
C) d-block elements. 
D) f-block elements. 
E) precious metals.

Exam 2: Atoms and the Periodic Table

Explain how the term "valence electrons" is related to electron configurations.Use the elements in group VI,Periods,3,4,and 5,as examples.

An imaginary element Xz consists of two isotopes having masses of 100.0 amu and 102.0 amu.A sample of Xz was found to contain 75.0% of the 100Xz isotope and 25.0% of the 102Xz.Calculate the atomic weight of Xz.

Which of the following elements is a noble gas?

How many electrons are there in the valence shell of a nitrogen atom?

An s-block element in the 5th Period is

In terms of atomic structure,the common characteristic of elements in the same group is

Which column of the periodic table contains only nonmetals?

The number of valence electrons in an element with electron configuration 1s2 2s2 2p6 3s2 3p4 is ________.

What is the electron configuration of S?

Which characteristics correctly describe an electron?

What is the maximum number of electrons that can occupy the 4f orbitals?

The shell having n = 3 contains ________ subshells,________ orbitals,and up to ________ electrons

An imaginary element Xq consists of two isotopes having masses of 100.0 amu and 102.0 amu.A sample of Xq was found to contain 20.0% of the 100Xq isotope and 80.0% of the 102Xq.Calculate the atomic weight of Xq.

An atom containing 29 protons,29 electrons,and 34 neutrons has a mass number of

Naturally occurring iron contains 5.82% 54Fe,91.66 % 56Fe,2.19% 57Fe,and 0.33% 58Fe.The respective atomic masses are 53.940 amu,55.935 amu,56.935 amu,and 57.933 amu.Calculate the average atomic mass of iron.

The value for A for an atom containing 47 protons,47 electrons,and 60 neutrons is

The value of A for an atom containing 29 protons,29 electrons,and 34 neutrons is

The element which has four valence electrons is ________.

Which element is most likely to have chemical properties similar to those of potassium (atomic number 19)?

Transition metals can also be called

Matter and Measurements

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Chemical Reactions: Energy, rates, and Equilibrium

Gases, liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Amines

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

The Generation of Biochemical Energy

Carbohydrates

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Protein and Amino Acid Metabolism

Chemical Messengers: Hormones, neurotransmitters, and Drugs

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An imaginary element Xz consists of two isotopes having masses of 100.0 amu and 102.0 amu.A sample of Xz was found to contain 75.0% of the ¹⁰⁰Xz isotope and 25.0% of the ¹⁰²Xz.Calculate the atomic weight of Xz.

The number of valence electrons in an element with electron configuration 1s²2s²2p⁶3s²3p⁴ is ________.

The shell having n = 3 contains subshells, orbitals,and up to electrons

An imaginary element Xq consists of two isotopes having masses of 100.0 amu and 102.0 amu.A sample of Xq was found to contain 20.0% of the ¹⁰⁰Xq isotope and 80.0% of the ¹⁰²Xq.Calculate the atomic weight of Xq.

Naturally occurring iron contains 5.82% ⁵⁴Fe,91.66 % ⁵⁶Fe,2.19% ⁵⁷Fe,and 0.33% ⁵⁸Fe.The respective atomic masses are 53.940 amu,55.935 amu,56.935 amu,and 57.933 amu.Calculate the average atomic mass of iron.