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Which of the following has the highest energy electron configuration?

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Question: Which of the following has the highest energy electron configuration?

Options:

  1. 1s2 2s2 2p6 3s2 3p6
  2. 1s2 2s2 2p6 3s2 3p5
  3. 1s2 2s2 2p6 3s2 3p4
  4. 1s2 2s2 2p6 3s2 3p3

Correct Answer: 1s2 2s2 2p6 3s2 3p5

Solution: 

The configuration 1s2 2s2 2p6 3s2 3p5 (Chlorine) has the highest energy due to the presence of an unpaired electron.

Which of the following has the highest energy electron configuration?

Practice Questions

Q1
Which of the following has the highest energy electron configuration?
  1. 1s2 2s2 2p6 3s2 3p6
  2. 1s2 2s2 2p6 3s2 3p5
  3. 1s2 2s2 2p6 3s2 3p4
  4. 1s2 2s2 2p6 3s2 3p3

Questions & Step-by-Step Solutions

Which of the following has the highest energy electron configuration?
Correct Answer: Chlorine (Cl)
  • Step 1: Understand what an electron configuration is. It shows how electrons are arranged in an atom.
  • Step 2: Look at the given electron configuration: 1s2 2s2 2p6 3s2 3p5.
  • Step 3: Identify the highest energy level in the configuration. The highest energy level is the one with the highest principal quantum number (n).
  • Step 4: In the configuration, the highest principal quantum number is 3 (from 3s and 3p).
  • Step 5: Check for unpaired electrons. Unpaired electrons have higher energy than paired ones.
  • Step 6: In the configuration 3s2 3p5, the 3p subshell has 5 electrons, meaning there are unpaired electrons.
  • Step 7: Conclude that the presence of unpaired electrons in the highest energy level (3) gives this configuration the highest energy.
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