Question 1

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

Accepted Answer

A)  [Kr]5 s 25 p 64 d 8
B)  [Kr]5 s 25 d 105 p 4
C)  [Kr]5 s 24 d 105 p 6
D)  [Kr]5 s 24 f 14
E)  [Kr]5 s 24 d 105 p 4F) A) and B)
G) B) and E)

Question 2

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

Accepted Answer

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

Question 3

Select the paramagnetic ion.

Accepted Answer

A)  Cu +
B)  Ag +
C)  Fe 3+
D)  Cd 2+
E)  Ca 2+F) A) and D)
G) B) and C)

Question 4

Metallic behavior is generally associated with

Accepted Answer

A)  elements with very negative electron affinities.
B)  elements with low ionization energies.
C)  elements with small atomic radii.
D)  elements with unpaired electrons.
E)  elements with partially filled p orbitals.F) All of the above
G) A) and C)

Question 5

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 6

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

Accepted Answer

A) True 
 B)False  False

Question 7

Select the most basic compound from the following.

Accepted Answer

A)  Bi 2O 3
B)  SiO 2
C)  Cs 2O
D)  Na 2O
E)  H 2OF) A) and B)
G) C) and D) C

Question 8

Elements in which the outermost electron has the same principal quantum number n, show similar chemical properties.

Accepted Answer

A) True 
 B)False  False

Question 9

Which one of the following statements about orbital energies is incorrect?

Accepted Answer

A)  In the hydrogen atom, the energy of an orbital depends only on the value of the quantum number n.
B)  In many-electron atoms the energy of an orbital depends on both n and l.
C)  Inner electrons shield outer electrons more effectively than do electrons in the same orbital.
D)  The splitting of sublevels in many-electron atoms is explained in terms of the penetration effect.
E)  The energy of a given orbital increases as the nuclear charge Z increases.F) A) and D)
G) A) and C)

Question 10

Which of the following elements has the greatest atomic radius?

Accepted Answer

A)  Li
B)  Ne
C)  Rb
D)  Sr
E)  XeF) B) and D)
G) A) and E)

Question 11

Which of the following electron configurations is not possible for an atom in an excited state?

Accepted Answer

A)  1 s 22 s 22 p 63 s 23 p 63 d 104 s 14 p 1
B)  1 s 22 s 22 p 63 s 13 p 5
C)  1 s 22 s 22 p 63 s 23 p 23 d 2
D)  1 s 22 s 22 p 63 s 23 p 63 d 104 s 2
E)  1 s 22 s 22 p 63 s 23 p 63 d 104 s 14 p 3F) A) and B)
G) A) and C)

Question 12

Select the element with the least metallic character.

Accepted Answer

A)  Sn
B)  Sr
C)  Tl
D)  Ge
E)  GaF) A) and D)
G) B) and D)

Question 13

Hund's rule is used to predict the electron configuration of atoms in excited states.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following sets of elements have the [noble gas]ns2np2 valence electron configuration?

Accepted Answer

A)  O, S, Se, Te, Po
B)  N, P, As, Sb, Bi
C)  F, Cl, Br, I, At
D)  C, Si, Ge, Sn, Pb
E)  Ti, Zr, HfF) A) and B)
G) B) and D)

Question 15

In a single atom, what is the maximum number of electrons which can have quantum number n = 4?

Accepted Answer

A)  16
B)  18
C)  32
D)  36
E)  None of these choices are correct.F) B) and C)
G) D) and E)

Question 16

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) B) and C)
G) A) and C)

Question 17

When comparing the successive ionization energies of an element, an unusually big increase in ionization energy is seen when

Accepted Answer

A)  the first valence electron is removed.
B)  the second valence electron is removed.
C)  the eighth electron of is removed.
D)  the first core electron is removed.
E)  the last valence electron is removed.F) A) and E)
G) None of the above

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 is paramagnetic?

Accepted Answer

A)  Kr
B)  Zn
C)  Sr
D)  V
E)  ArF) A) and E)
G) B) and E)

Question 20

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 choices are correct.F) A) and B)
G) B) and D)

Exam 8: Electron Configuration and Chemical Periodicity

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the paramagnetic ion.

Correct AnswerverifiedShow Answer

Metallic behavior is generally associated with

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

Correct AnswerverifiedFalse

Select the most basic compound from the following.

Correct AnswerverifiedC

Elements in which the outermost electron has the same principal quantum number n, show similar chemical properties.

Correct AnswerverifiedFalse

Which one of the following statements about orbital energies is incorrect?

Correct AnswerverifiedShow Answer

Which of the following elements has the greatest atomic radius?

Correct AnswerverifiedShow Answer

Which of the following electron configurations is not possible for an atom in an excited state?

Correct AnswerverifiedShow Answer

Select the element with the least metallic character.

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Hund's rule is used to predict the electron configuration of atoms in excited states.

Correct AnswerverifiedShow Answer

Which of the following sets of elements have the [noble gas]ns2np2 valence electron configuration?

Correct AnswerverifiedShow Answer

In a single atom, what is the maximum number of electrons which can have quantum number n = 4?

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

When comparing the successive ionization energies of an element, an unusually big increase in ionization energy is seen when

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following elements is paramagnetic?

Correct AnswerverifiedShow 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

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Which of the following sets of elements have the [noble gas]ns²np² valence electron configuration?

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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.

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