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**Chapter 7 Electronic Structure of Atoms**

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Considering only the n = 1 to n = 5 states in the hydrogen atom, which transition will emit the most energy? n = 5 to n = 4 n = 5 to n = 2 n = 3 to n = 1 n = 3 to n = 2 n = 4 to n = 2

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Considering only the n = 1 to n = 5 states in the hydrogen atom, which transition will emit the most energy? n = 5 to n = 4 n = 5 to n = 2 n = 3 to n = 1 n = 3 to n = 2 n = 4 to n = 2

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Considering only the n = 1 to n = 5 states in the hydrogen atom, which transition will emit the longest wavelength? n = 5 to n = 4 n = 5 to n = 2 n = 3 to n = 1 n = 3 to n = 2 n = 4 to n = 2

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Considering only the n = 1 to n = 5 states in the hydrogen atom, which transition will emit the longest wavelength? n = 5 to n = 4 n = 5 to n = 2 n = 3 to n = 1 n = 3 to n = 2 n = 4 to n = 2

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**What are the valence electrons of vanadium?**

4s2 3d3 3d5 4d5

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**What are the valence electrons of vanadium?**

4s2 3d3 3d5 4d5

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**What are the valence electrons of gallium?**

4p1 4s2 3d10 4p1 4s2 3d10 4s2 4p1

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**What are the valence electrons of gallium?**

4p1 4s2 3d10 4p1 4s2 3d10 4s2 4p1

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**What is the maximum number of orbitals described by the quantum numbers:**

n = 3 l = 2 1 3 5 8 9

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**What is the maximum number of orbitals described by the quantum numbers:**

n = 3 l = 2 1 3 5 8 9

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**What is the maximum number of electrons described by the quantum numbers:**

7 14 16 32 48

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**What is the maximum number of electrons described by the quantum numbers:**

7 14 16 32 48

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**How many nodal planes does a d orbital have?**

1 2 3 4

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**How many nodal planes does a d orbital have?**

1 2 3 4

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**How many unpaired electrons does selenium have?**

2 4 6 8

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**How many unpaired electrons does selenium have?**

2 4 6 8

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**How many unpaired electrons does chromium have?**

2 4 6 8

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**How many unpaired electrons does chromium have?**

2 4 6 8

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**What is the wavelength for radiation transmitted by WGR, 550 AM (550 kHz)?**

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**Correct Answer: c (3.0 10 ms ) l = = n (5.5 10 s ) 0.545 m 5.45 m**

8 ms - 1 ) l = = n (5.5 10 5 s - 1 )

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**Predict which of the following electronic transitions will produce the longest wavelength**

spectral line. n = 4 to n = 2 n = 5 to n = 2 n = 5 to n = 3 n = 6 to n = 4

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Correct Answer: n = 4 to n = 2 n = 5 to n = 2 n = 5 to n = 3 n = 6 to n = 4 The wavelength increases as frequency decreases. The lowest frequency (longest wavelength) is associated with the lowest energy, and the smallest energy difference here is between n = 6 and n = 4.

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**Mass of helium 4 ion = 6.6 1027 g.**

What is the wavelength of a helium4 ion moving in a cyclotron at 1.0% the speed of light? Mass of helium 4 ion = 6.6 1027 g. 3.3 106 m 3.3 108 m 3.3 1011 m 3.3 1014 m

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**Correct Answer: l = 3.3 10 h (6.63 10 Js) l = = mv (6.6 10 kg)(3.0 10**

10 - 34 Js) l = = mv (6.6 10 - 30 kg)(3.0 10 6 ms - 1 ) l = 3.3 10 - 11

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**Which of the following is not an allowed set of quantum numbers?**

n = 3, l = 1, ml = 1 n = 3, l = 3, ml =2 n = 4, l = 0, ml = 0 n = 3, l = 1, ml =1

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**Correct Answer: The value of l can be no larger than n 1.**

n = 3, l = 1, ml = 1 n = 3, l = 3, ml =2 n = 4, l = 0, ml = 0 n = 3, l = 1, ml =1 The value of l can be no larger than n 1.

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**How many electrons maximum can exist in the 4d orbital?**

2 6 10 14

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Correct Answer: 2 6 10 14 There are five 4d orbitals, each of which can contain up to 2 electrons each for a total of 10 maximum.

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The electron subshell 3p represents the principal quantum number n = ___ and azimuthal quantum number l = ___. 3; 2 2; 3 3; 1 1; 3

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Correct Answer: 3; 2 2; 3 3; 1 1; 3 The principal quantum number n is 3, and a p orbital indicates l = 1.

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**The maximum number of electrons in an atom that can exist in the 4f subshell and have ml = 1 is**

2 7 14 32

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Correct Answer: 2 7 14 32 For any value of ml, the maximum number of electrons is 2.

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**The following orbital diagram represents the electron configuration of which element?**

Carbon Nitrogen Oxygen Neon

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Correct Answer: 1s 2s 2p Carbon Nitrogen Oxygen Neon

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**The element with the electronic configuration [Ar]4s13d5 is:**

Manganese Chromium Magnesium Iron

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Correct Answer: Manganese Chromium Magnesium Iron

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**What is the characteristic outer shell electron configuration of the noble gases?**

s2p6 s2p5 s2p4 s2p3

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Correct Answer: s2p6 s2p5 s2p4 s2p3 Noble gases have completely filled s and p orbitals, hence their lack of reactivity.

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**Which of the following orbital diagrams obeys Hund’s rule for a ground-state atom?**

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Correct Answer: 3s 3d 3s 3d 3s 3d

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