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If energy is absorbed by a hydrogen atom in its ground state, the atom is excited to a higher energy state. For example, the excitation of an electron from n = 1 to n = 3 requires radiation with a wavelength of 102.6 nm. Which of the following transitions would require radiation of longer wave- length than this? (a) n = 2 to n = 4 (b) n = 1 to n = 4 (c) n = 1 to n = 5 (d) n = 3 to n = 5

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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 6, Problem 20PS
Textbook Problem
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If energy is absorbed by a hydrogen atom in its ground state, the atom is excited to a higher energy state. For example, the excitation of an electron from n = 1 to n = 3 requires radiation with a wavelength of 102.6 nm. Which of the following transitions would require radiation of longer wave- length than this?

  1. (a) n = 2 to n = 4
  2. (b) n = 1 to n = 4
  3. (c) n = 1 to n = 5
  4. (d) n = 3 to n = 5

Interpretation Introduction

Interpretation:

The half transition that needed for radiation with longer wavelength than n=1 to the n=3 level is to be determined from the given option.

Concept introduction:

  • Electronic transitions that take place in excited H atom is,
    1. 1. Lyman series: electronic transitions take place to the n=1 level and it is in ultraviolet region.
  1. 2. Balmer series: electronic transitions take place from n>2 to the n=2 level and it is in visible region.
  2. 3. Ritz-Paschen series: electronic transitions take place from n>3 to the n=3 level and it is in infrared region.
  3. 4. Brackett series: electronic transitions take place from n>4 to the n=4 level.
  4. 5. Pfund series: electronic transitions take place from n>5 to the n=5 level

As the energy gap between two transition states increases the frequency of the radiation emitted also increasesE=hν

Explanation of Solution

Reason for correct option:

The energy is low when the differences in energy levels are small which implies that it has higher wavelength.

The wavelength of radiation emitted increases as the differences in energy levels are decreases.

Therefore, in a transition, the radiations with longer wavelength than n=1 to the n=3 level are emitted from n=2 to the n=4 level.

Hence, the correct option for the transition that needed for radiation with longer wavelength than n=1 to the n=3 level is option a.

Reasons for incorrect options:

Write all the transition that needed for radiation with longer wavelength than n=1 to the n=3 level given in the options except option a

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Chapter 6 Solutions

Chemistry & Chemical Reactivity
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