Question 1

In the Bohr Model of the hydrogen atom,what is the ratio of the speed of the electron moving in the n = 2 orbit divided by the speed of the electron in the n = 3 orbit?

Accepted Answer

A) 0.66 
B) 1.5 
C) 2.25 
D) 0.44 
E) its speed is independent of n 
A) 0.66 
B) 1.5 
C) 2.25 
D) 0.44 
E) its speed is independent of n B

Question 2

The red line in the hydrogen emission spectrum is 656 nm.If the energy of the nth level is -13.6/n 2 eV,then calculate the transition between n levels that this emitted photon comes from.

Accepted Answer

A) n = 2 to n = 3 
B) n = 4 to n = 3 
C) n = 5 to n = 2 
D) n = 3 to n = 2 
E) n = 2 to n = 4 
A) n = 2 to n = 3 
B) n = 4 to n = 3 
C) n = 5 to n = 2 
D) n = 3 to n = 2 
E) n = 2 to n = 4 D

Question 3

You will never find an electron in state

Accepted Answer

A) 3S 
B) 3P 
C) 3D 
D) 3F 
E) 9S 
A) 3S 
B) 3P 
C) 3D 
D) 3F 
E) 9S D

Question 4

For the principal quantum number n = 4,the number of values the magnetic quantum number m can have is

Accepted Answer

A) 4 
B) 3 
C) 7 
D) 16 
E) 6 
A) 4 
B) 3 
C) 7 
D) 16 
E) 6

Question 5

The total angular momentum of a hydrogen atom in a given excited state has the quantum number j = 5/2.The orbital angular-momentum quantum number   must have the values

Accepted Answer

A) 0 or 1 
B) 1 or 2 
C) 2 or 3 
D) 3 or 4 
E) 5 or 6 
A) 0 or 1 
B) 1 or 2 
C) 2 or 3 
D) 3 or 4 
E) 5 or 6

Question 6

For the hydrogen atom in the state n = 2,l = 0,m = 0,the radial probability density is   The probability of finding the electron in the range $\Delta$r = 0.04a0 at r = 1.5a0 is

Accepted Answer

A) 0.00377 
B) 0.00249 
C) 0.00428 
D) 0.0271 
E) zero 
A) 0.00377 
B) 0.00249 
C) 0.00428 
D) 0.0271 
E) zero

Question 7

The total number of distinct electron states (including spin)when n = 5 is

Accepted Answer

A) 18 
B) 22 
C) 25 
D) 50 
E) 72 
A) 18 
B) 22 
C) 25 
D) 50 
E) 72

Question 8

The energy of an X-ray photon of wavelength 3.0 $\times$ 10-10 m is

Accepted Answer

A) 1.0 $\times$ 10-16 J 
B) 9.9 $\times$ 10-16 J 
C) 6.6 $\times$ 10-16 J 
D) 2.2 $\times$ 10-24 J 
E) 3.2 $\times$ 10-29 J 
A) 1.0 $\times$ 10-16 J 
B) 9.9 $\times$ 10-16 J 
C) 6.6 $\times$ 10-16 J 
D) 2.2 $\times$ 10-24 J 
E) 3.2 $\times$ 10-29 J

Question 9

If the angular momentum is characterized by the quantum number   = 3,what is the smallest possible angle between   and the z axis?

Accepted Answer

A) 12.1º 
B) 17.5º 
C) 23.2º 
D) 27.4º 
E) 30.0º 
A) 12.1º 
B) 17.5º 
C) 23.2º 
D) 27.4º 
E) 30.0º

Question 10

Using Bohr's model,the speed of an electron in the first orbit is

Accepted Answer

A) 3.14 $\times$ 105 m/s 
B) 1.09 $\times$ 106 m/s 
C) 1.37 $\times$ 107 m/s 
D) 2.19 $\times$ 106 m/s 
E) None of these is correct. 
A) 3.14 $\times$ 105 m/s 
B) 1.09 $\times$ 106 m/s 
C) 1.37 $\times$ 107 m/s 
D) 2.19 $\times$ 106 m/s 
E) None of these is correct.

Question 11

The critical experiments that established the nuclear nature of atoms were performed by

Accepted Answer

A) Bohr 
B) Balmer 
C) Rydberg and Ritz 
D) Geiger and Marsden 
E) Thomson 
A) Bohr 
B) Balmer 
C) Rydberg and Ritz 
D) Geiger and Marsden 
E) Thomson

Question 12

For the hydrogen atom in the state n = 2,l = 0,m = 0,the radial probability density is   The probability of finding the electron in the range $\Delta$r = 0.04a0 at r = 2a0 is

Accepted Answer

A) 0.0167 
B) 0.149 
C) 0.128 
D) 0.0241 
E) zero 
A) 0.0167 
B) 0.149 
C) 0.128 
D) 0.0241 
E) zero

Question 13

The constant in the Rydberg-Ritz formula is RH = 10.96776 µm-1.The wavelength predicted by this formula for n1 = 5 and n2 = 3 is

Accepted Answer

A) 656 nm 
B) 486 nm 
C) 434 nm 
D) 410 nm 
E) None of these is correct. 
A) 656 nm 
B) 486 nm 
C) 434 nm 
D) 410 nm 
E) None of these is correct.

Question 14

It was _______ who showed that the periodic table of the elements can be understood in terms of the principle that "no two electrons in the same atomic system can have the same unique set of quantum numbers."

Accepted Answer

A) N.Bohr 
B) A.Einstein 
C) W.Heisenberg 
D) E.Schrödinger 
E) W.Pauli 
A) N.Bohr 
B) A.Einstein 
C) W.Heisenberg 
D) E.Schrödinger 
E) W.Pauli

Question 15

Which of the following atomic numbers (which are the same as the number of electrons in a neutral atom)correspond to a Group 2 metal,i.e.their ground-state electronic configuration ends in "..s2"?

Accepted Answer

A) 4,14,20 
B) 4,22,40 
C) 6,12,22 
D) 4,12,38 
E) 4,14,38 
A) 4,14,20 
B) 4,22,40 
C) 6,12,22 
D) 4,12,38 
E) 4,14,38

Question 16

If the angular momentum is characterized by the quantum number   = 3,what are the possible values of Lz in units of   ?

Accepted Answer

A) -3,0,+3 
B) -3,-2,-1,0 
C) -3,-2,-1,0,+1,+2,+3 
D) -2,-1,0,+1,+2 
A) -3,0,+3 
B) -3,-2,-1,0 
C) -3,-2,-1,0,+1,+2,+3 
D) -2,-1,0,+1,+2

Question 17

The total angular momentum is   ,the orbital angular momentum is   ,and the spin angular momentum is   .The relationship between these three quantities is

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 18

For the hydrogen atom in the ground state,the radial probability density is   The probability of finding the electron in the range $\Delta$r = 0.04a0 at r = 2a0 is

Accepted Answer

A) 0.0463 
B) 0.0184 
C) 0.0217 
D) 0.0117 
E) 0.0341 
A) 0.0463 
B) 0.0184 
C) 0.0217 
D) 0.0117 
E) 0.0341

Question 19

Which of the following statements is true?

Accepted Answer

A) The size of the nucleus of an atom is $\backsim$105 times smaller than the size of the atom. 
B) The size of an atom is determined by the electron cloud. 
C) Most of an atom is empty space. 
D) The mass of an atom is determined primarily by the mass of the nucleus. 
E) All of these are correct. 
A) The size of the nucleus of an atom is $\backsim$105 times smaller than the size of the atom. 
B) The size of an atom is determined by the electron cloud. 
C) Most of an atom is empty space. 
D) The mass of an atom is determined primarily by the mass of the nucleus. 
E) All of these are correct.

Question 20

In the Bohr Model of the hydrogen atom,what is the kinetic energy of the electron in the n = 3 orbit? (The radius of the 1st Bohr orbit is 0.0529 nm.)

Accepted Answer

A) 3.44 eV 
B) 1.51 eV 
C) 3.02 eV 
D) 0.75 eV 
E) 4.53 eV 
A) 3.44 eV 
B) 1.51 eV 
C) 3.02 eV 
D) 0.75 eV 
E) 4.53 eV

Exam 36: Atoms

In the Bohr Model of the hydrogen atom,what is the ratio of the speed of the electron moving in the n = 2 orbit divided by the speed of the electron in the n = 3 orbit?

The red line in the hydrogen emission spectrum is 656 nm.If the energy of the nth level is -13.6/n 2 eV,then calculate the transition between n levels that this emitted photon comes from.

You will never find an electron in state

For the principal quantum number n = 4,the number of values the magnetic quantum number m can have is

The total angular momentum of a hydrogen atom in a given excited state has the quantum number j = 5/2.The orbital angular-momentum quantum number must have the values

For the hydrogen atom in the state n = 2,l = 0,m = 0,the radial probability density is The probability of finding the electron in the range Δ\DeltaΔ r = 0.04a0 at r = 1.5a0 is

The total number of distinct electron states (including spin)when n = 5 is

The energy of an X-ray photon of wavelength 3.0 ×\times× 10-10 m is

If the angular momentum is characterized by the quantum number = 3,what is the smallest possible angle between and the z axis?

Using Bohr's model,the speed of an electron in the first orbit is

The critical experiments that established the nuclear nature of atoms were performed by

For the hydrogen atom in the state n = 2,l = 0,m = 0,the radial probability density is The probability of finding the electron in the range Δ\DeltaΔ r = 0.04a0 at r = 2a0 is

The constant in the Rydberg-Ritz formula is RH = 10.96776 µm-1.The wavelength predicted by this formula for n1 = 5 and n2 = 3 is

It was _______ who showed that the periodic table of the elements can be understood in terms of the principle that "no two electrons in the same atomic system can have the same unique set of quantum numbers."

Which of the following atomic numbers (which are the same as the number of electrons in a neutral atom)correspond to a Group 2 metal,i.e.their ground-state electronic configuration ends in "..s2"?

If the angular momentum is characterized by the quantum number = 3,what are the possible values of Lz in units of ?

The total angular momentum is ,the orbital angular momentum is ,and the spin angular momentum is .The relationship between these three quantities is

For the hydrogen atom in the ground state,the radial probability density is The probability of finding the electron in the range Δ\DeltaΔ r = 0.04a0 at r = 2a0 is

Which of the following statements is true?

In the Bohr Model of the hydrogen atom,what is the kinetic energy of the electron in the n = 3 orbit? (The radius of the 1st Bohr orbit is 0.0529 nm.)

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The red line in the hydrogen emission spectrum is 656 nm.If the energy of the nth level is -13.6/n ² eV,then calculate the transition between n levels that this emitted photon comes from.

The energy of an X-ray photon of wavelength 3.0 $\times$ 10^-10 m is

The constant in the Rydberg-Ritz formula is R_H = 10.96776 µm^-1.The wavelength predicted by this formula for n₁ = 5 and n₂ = 3 is

Which of the following atomic numbers (which are the same as the number of electrons in a neutral atom)correspond to a Group 2 metal,i.e.their ground-state electronic configuration ends in "..s^2"?

If the angular momentum is characterized by the quantum number = 3,what are the possible values of L_z in units of ?