Question 1

"Electrons added to atomic orbitals of the same energy will remain unpaired with parallel spins until the subshell is more than half-filled" is a statement of

Accepted Answer

A)   the aufbau principle.
B)   Hund's rule.
C)   the Pauli exclusion principle.
D)   the periodic law.
E)   the singularity rule.F) A) and E)
G) C) and D)

Question 2

Select the element with the greatest metallic character.

Accepted Answer

A)   Li
B)   Ca
C)   Al
D)   Pb
E)   CsF) A) and B)
G) A) and C)

Question 3

Select the correct electron configuration for Te (Z = 52) .

Accepted Answer

A)   [Kr]5s25p64d8
B)   [Kr]5s25d105p4
C)   [Kr]5s24d105p6
D)   [Kr]5s24f14
E)   [Kr]5s24d105p4F) B) and C)
G) A) and C)

Question 4

First ionization energies of neutral atoms may be positive or negative.

Accepted Answer

A) True 
 B)False

Question 5

In Mendeleev's version of the periodic table, the elements were arranged in order of increasing atomic number.

Accepted Answer

A) True 
 B)False

Question 6

According to the exclusion principle, two is the maximum number of electrons in an atom which can share the same four quantum numbers.

Accepted Answer

A) True 
 B)False

Question 7

. Also, explain why the values of these properties are so different between these two groups.

Accepted Answer

Group 1A (1) atoms are much la...

Question 8

Select the correct set of quantum numbers (n, l, ml, ms)  for the first electron removed in the formation of a cation for strontium, Sr.

Accepted Answer

A)   5, 1 , 0, -½
B)   5, 1, 0, ½
C)   5, 0, 1, ½
D)   5, 1, 1, ½
E)   5, 0, 0, -½F) C) and D)
G) A) and B)

Question 9

Which of the following electron configurations is correct for the excited state of an element?

Accepted Answer

A)   [He]2s22p5
B)   [Ne]3s23p1
C)   [Ar]4s14p1
D)   [Kr]5s24d7
E)   [He]1p1F) C) and E)
G) None of the above

Question 10

What is the correct order of decreasing size of the following ions?

Accepted Answer

A)   P3¯ > Cl¯ > K+ > Ca2+
B)   Ca2+ > K+ > Cl¯ > P3¯
C)   K+ > Cl¯ > Ca2+ > P3¯
D)   K+ > Cl¯ > P3¯ > Ca2+
E)   None of these choices is correct.F) B) and E)
G) A) and B)

Question 11

Energy states of atoms containing more than one electron arise from nucleus-electron and electron-electron interactions. Which of the following statements correctly describes these effects?

Accepted Answer

A)   Larger nuclear charge lowers energy, more electrons in an orbital lowers energy.
B)   Larger nuclear charge lowers energy, more electrons in an orbital increases energy.
C)   Smaller nuclear charge lowers energy, more electrons in an orbital lowers energy.
D)   Smaller nuclear charge lowers energy, more electrons in an orbital increases energy.
E)   None of these statements is generally correct.F) B) and E)
G) D) and E)

Question 12

The electronic structure 1s22s22p63s23p64s23d8 refers to the ground state of:

Accepted Answer

A)   Kr
B)   Ni
C)   Fe
D)   Pd
E)   None of these choices is correct.F) A) and B)
G) A) and C)

Question 13

In the electron configuration [Ar]4s23d104p4, which are valence electrons?

Accepted Answer

A)   all of the electrons after the [Ar]
B)   only the 4s2 electrons
C)   only the 3d10 electrons
D)   only the 4p4 electrons
E)   both the 4s2 and the 4p4 electronsF) D) and E)
G) None of the above

Question 14

The difference in energies between the 1s and 2s orbitals is due to the penetration effect.

Accepted Answer

A) True 
 B)False

Question 15

Select the most acidic compound from the following:

Accepted Answer

A)   SO2
B)   Al2O3
C)   CaO
D)   PbO
E)   H2OF) C) and E)
G) B) and E)

Question 16

Electron affinities of neutral atoms may be positive or negative.

Accepted Answer

A) True 
 B)False

Question 17

Moseley's measurements of nuclear charges of the elements provided the basis for arranging the elements of the periodic table in order of increasing atomic number.

Accepted Answer

A) True 
 B)False

Question 18

A negative electron affinity implies that the atom repels an approaching electron.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following elements has the smallest first ionization energy?

Accepted Answer

A)   Rb
B)   Mg
C)   I
D)   As
E)   FF) B) and D)
G) A) and D)

Question 20

State Hund's rule, and show how it applies to the ground state of phosphorus atoms.

Accepted Answer

Electrons occupy orbitals within the sam...

Exam 8: Electron Configuration and Chemical Periodicity

"Electrons added to atomic orbitals of the same energy will remain unpaired with parallel spins until the subshell is more than half-filled" is a statement of

Correct AnswerverifiedShow Answer

Select the most acidic compound from the following:

Correct AnswerverifiedShow Answer

A negative electron affinity implies that the atom repels an approaching electron.

Correct AnswerverifiedShow Answer

State Hund's rule, and show how it applies to the ground state of phosphorus atoms.

Correct AnswerverifiedElectrons occupy orbitals within the sam...View AnswerShow Answer

What is the correct order of decreasing size of the following ions?

Correct AnswerverifiedShow Answer

In Mendeleev's version of the periodic table, the elements were arranged in order of increasing atomic number.

Correct AnswerverifiedShow Answer

The difference in energies between the 1s and 2s orbitals is due to the penetration effect.

Correct AnswerverifiedShow Answer

Electron affinities of neutral atoms may be positive or negative.

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Which of the following elements has the smallest first ionization energy?

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. Also, explain why the values of these properties are so different between these two groups.

Correct AnswerverifiedGroup 1A (1) atoms are much la...View AnswerShow Answer

Energy states of atoms containing more than one electron arise from nucleus-electron and electron-electron interactions. Which of the following statements correctly describes these effects?

Correct AnswerverifiedShow Answer

Which of the following electron configurations is correct for the excited state of an element?

Correct AnswerverifiedShow Answer

Moseley's measurements of nuclear charges of the elements provided the basis for arranging the elements of the periodic table in order of increasing atomic number.

Correct AnswerverifiedShow Answer

The electronic structure 1s22s22p63s23p64s23d8 refers to the ground state of:

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In the electron configuration [Ar]4s23d104p4, which are valence electrons?

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According to the exclusion principle, two is the maximum number of electrons in an atom which can share the same four quantum numbers.

Correct AnswerverifiedShow Answer

First ionization energies of neutral atoms may be positive or negative.

Correct AnswerverifiedShow Answer

Select the element with the greatest metallic character.

Correct AnswerverifiedShow Answer

Select the correct electron configuration for Te (Z = 52) .

Correct AnswerverifiedShow Answer

Select the correct set of quantum numbers (n, l, ml, ms) for the first electron removed in the formation of a cation for strontium, Sr.

Correct AnswerverifiedShow Answer

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Electrons occupy orbitals within the sam...
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Group 1A (1) atoms are much la...
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The electronic structure 1s²2s²2p⁶3s²3p⁶4s²3d⁸ refers to the ground state of:

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In the electron configuration [Ar]4s²3d¹⁰4p⁴, which are valence electrons?

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Select the correct set of quantum numbers (n, l, m_l, m_s) for the first electron removed in the formation of a cation for strontium, Sr.

Correct Answer
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