Question 1

Consider the following portion of the energy-level diagram for hydrogen: 
-The energy expressions for the electrons in the He+ ion and the hydrogen atom are
En (H) = -a/n2 and En (He+) = -4a/n2
Which of the following statements is(are) correct?
i.For the transitions n1 → n2 , the frequency is larger for H than for He+.II.The first ionization energy of the H atom is smaller than the second ionization energy of the He atom.III.The 1s orbital in He+ is larger (in the sense that the probability density is shifted outward) than the 1s orbital in H.

Accepted Answer

A)  III only 
B)  I and II only 
C)  I only 
D)  I, II, and III 
E)  II only

Question 2

What is the electron configuration of Ti2+?

Accepted Answer

A)  [Ar] 3d2 
B)  [Ar] 4s2 
C)  [Ar] 4s13d1 
D)  [Ar] 4s23d2 
E)  none of these

Question 3

Which of the following is not determined by the principal quantum number, n, of the electron in a hydrogen atom?

Accepted Answer

A)  the minimum wavelength of the light needed to remove the electron from the atom. 
B)  the energy of the electron 
C)  the shape of the corresponding atomic orbital(s) 
D)  the size of the corresponding atomic orbital(s) 
E)  All of the above are determined by n.

Question 4

What value is the closest estimate of Zeff for a valence electron of the calcium atom?

Accepted Answer

A)  20 
B)  40 
C)  2 
D)  6 
E)  1

Question 5

Sodium losing an electron is an ________ process, and fluorine losing an electron is an _______ process.

Accepted Answer

A)  exothermic, endothermic 
B)  endothermic, exothermic 
C)  exothermic, exothermic 
D)  More information is needed. 
E)  endothermic, endothermic

Question 6

For the set of elements Li, K, Ar, and Kr, which element has the largest atomic radius? Explain any deviation from the expected pattern.

Accepted Answer

The answer of For the set of elements Li, K,...

Question 7

An element with the electron configuration [Xe]4f145d76s2 would belong to which class on the periodic table?

Accepted Answer

A)  transition elements 
B)  alkaline earth elements 
C)  rare earth elements 
D)  halogens 
E)  none of these

Question 8

Which of the following statements is/are true of the Group 1A elements of the periodic table?
1) Lithium, sodium, potassium, rubidium, cesium, and francium are the most reactive of the metals.
2) Hydrogen behaves as a nonmetal because the electron in its small 1s orbital is bound very tightly to the nucleus.
3) The first ionization energy of the elements decreases and the atomic radius increases as one moves down the group.

Accepted Answer

A)  ​1 only 
B)  ​2 only 
C)  ​3 only 
D)  ​1, 2, and 3 
E)  ​1 and 2

Question 9

Write the electron configuration for the following:
-Ca

Accepted Answer

The answer of Write the electron configuration for the following:
-Ca...

Question 10

Which of the following combinations of quantum numbers do not represent permissible solutions of the Schrodinger equation for the electron in the hydrogen atom? (In other words, which combination of quantum numbers is not allowed?) (Combinations are listed as follows: n, l, m(l), m(s).)

Accepted Answer

A)  6 5 -5 1/2 
B)  All are allowed. 
C)  8 2 2 1/2 
D)  9 8 -4 1/2 
E)  6 -5 -1 1/2

Question 11

​In 1927, the _____ principle was discovered that helps to understand the meaning of orbitals.

Accepted Answer

A)  ​Huygens-Fresnel 
B)  ​Pauli exclusion 
C)  ​Le Chatelier's 
D)  ​Heisenberg uncertainty 
E)  ​Cauchy's argument

Question 12

Consider the following portion of the energy-level diagram for hydrogen: 
-For an electron in a one-dimensional box, what is the minimum energy to excite the electron from the ground state?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 13

How many electrons in an atom can have the quantum numbers n = 4, l = 2?

Accepted Answer

A)  18 
B)  32 
C)  2 
D)  6 
E)  10

Question 14

A photographic film needs a minimum of 80.0 kJ/mol for exposure.What is the longest wavelength of radiation with sufficient energy to expose the film?

Accepted Answer

A)  1.50 × 10-3 m 
B)  1.50 × 10-12 m 
C)  1.50 × 10-6 m 
D)  1.50 × 10-9 m 
E)  none of these

Question 15

How many electrons can be described by the quantum numbers n = 4, l = 4, ml = 1?

Accepted Answer

A)  14 
B)  6 
C)  10 
D)  0 
E)  2

Question 16

Which of the following statements about quantum theory is incorrect?

Accepted Answer

A)  No two electrons can have the same four quantum numbers. 
B)  The energy and position of an electron cannot be determined simultaneously. 
C)  Lower energy orbitals are filled with electrons before higher energy orbitals. 
D)  When filling orbitals of equal energy, two electrons will occupy the same orbital before filling a new orbital. 
E)  All of these are correct.

Question 17

For the set of elements C, N, O, and F, which element has the smallest ionization energy? Explain any deviation from the expected pattern.

Accepted Answer

The answer of For the set of elements C, N,...

Question 18

Which atom has three 2p electrons in its ground state?

Accepted Answer

A)  Si 
B)  As 
C)  N 
D)  P 
E)  none of these

Question 19

What is the total number of electrons that can be accommodated in the level corresponding to n = 5?

Accepted Answer

A)  32 
B)  2 
C)  50 
D)  8 
E)  18

Question 20

Which element is most likely to form an ion with a charge of 2+?

Accepted Answer

A)  Rb 
B)  Al 
C)  F 
D)  S 
E)  Ca

Exam 12: Quantum Mechanics and Atomic Theory

What is the electron configuration of Ti²⁺?

Which of the following is not determined by the principal quantum number, n, of the electron in a hydrogen atom?

What value is the closest estimate of Z_eff for a valence electron of the calcium atom?

Sodium losing an electron is an __ process, and fluorine losing an electron is an _ process.

For the set of elements Li, K, Ar, and Kr, which element has the largest atomic radius? Explain any deviation from the expected pattern.

An element with the electron configuration [Xe]4f¹⁴5d⁷6s² would belong to which class on the periodic table?

Write the electron configuration for the following: -Ca

Which of the following combinations of quantum numbers do not represent permissible solutions of the Schrodinger equation for the electron in the hydrogen atom? (In other words, which combination of quantum numbers is not allowed?) (Combinations are listed as follows: n, l, m₍_l₎, m₍_{s) .})

In 1927, the _____ principle was discovered that helps to understand the meaning of orbitals.

Consider the following portion of the energy-level diagram for hydrogen: -For an electron in a one-dimensional box, what is the minimum energy to excite the electron from the ground state?

How many electrons in an atom can have the quantum numbers n = 4, l = 2?

A photographic film needs a minimum of 80.0 kJ/mol for exposure.What is the longest wavelength of radiation with sufficient energy to expose the film?

How many electrons can be described by the quantum numbers n = 4, l = 4, m_l = 1?

Which of the following statements about quantum theory is incorrect?

For the set of elements C, N, O, and F, which element has the smallest ionization energy? Explain any deviation from the expected pattern.

Which atom has three 2p electrons in its ground state?

What is the total number of electrons that can be accommodated in the level corresponding to n = 5?

Which element is most likely to form an ion with a charge of 2+?

Exam 12: Quantum Mechanics and Atomic Theory

What is the electron configuration of Ti2+?

Which of the following is not determined by the principal quantum number, n, of the electron in a hydrogen atom?

What value is the closest estimate of Zeff for a valence electron of the calcium atom?

Sodium losing an electron is an ________ process, and fluorine losing an electron is an _______ process.

For the set of elements Li, K, Ar, and Kr, which element has the largest atomic radius? Explain any deviation from the expected pattern.

An element with the electron configuration [Xe]4f145d76s2 would belong to which class on the periodic table?

Write the electron configuration for the following: -Ca

Which of the following combinations of quantum numbers do not represent permissible solutions of the Schrodinger equation for the electron in the hydrogen atom? (In other words, which combination of quantum numbers is not allowed?) (Combinations are listed as follows: n, l, m(l) , m(s) .)

​In 1927, the _____ principle was discovered that helps to understand the meaning of orbitals.

Consider the following portion of the energy-level diagram for hydrogen: -For an electron in a one-dimensional box, what is the minimum energy to excite the electron from the ground state?

How many electrons in an atom can have the quantum numbers n = 4, l = 2?

A photographic film needs a minimum of 80.0 kJ/mol for exposure.What is the longest wavelength of radiation with sufficient energy to expose the film?

How many electrons can be described by the quantum numbers n = 4, l = 4, ml = 1?

Which of the following statements about quantum theory is incorrect?

For the set of elements C, N, O, and F, which element has the smallest ionization energy? Explain any deviation from the expected pattern.

Which atom has three 2p electrons in its ground state?

What is the total number of electrons that can be accommodated in the level corresponding to n = 5?

Which element is most likely to form an ion with a charge of 2+?

What is the electron configuration of Ti²⁺?

What value is the closest estimate of Z_eff for a valence electron of the calcium atom?

Sodium losing an electron is an __ process, and fluorine losing an electron is an _ process.

An element with the electron configuration [Xe]4f¹⁴5d⁷6s² would belong to which class on the periodic table?

Which of the following combinations of quantum numbers do not represent permissible solutions of the Schrodinger equation for the electron in the hydrogen atom? (In other words, which combination of quantum numbers is not allowed?) (Combinations are listed as follows: n, l, m₍_l₎, m₍_{s) .})

In 1927, the _____ principle was discovered that helps to understand the meaning of orbitals.

How many electrons can be described by the quantum numbers n = 4, l = 4, m_l = 1?