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What is the principal quantum number of the valence electrons in chlorine?

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Question: What is the principal quantum number of the valence electrons in chlorine?

Options:

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Correct Answer: 3

Solution: 

Chlorine has an atomic number of 17, and its valence electrons are in the n=3 shell.

What is the principal quantum number of the valence electrons in chlorine?

Practice Questions

Q1
What is the principal quantum number of the valence electrons in chlorine?
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Questions & Step-by-Step Solutions

What is the principal quantum number of the valence electrons in chlorine?
Correct Answer: 3
  • Step 1: Find the atomic number of chlorine. Chlorine has an atomic number of 17.
  • Step 2: Determine the electron configuration of chlorine. The electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁵.
  • Step 3: Identify the valence electrons. Valence electrons are the electrons in the outermost shell, which for chlorine are in the 3s and 3p subshells.
  • Step 4: Determine the principal quantum number (n) for the outermost shell. For chlorine, the outermost shell is the third shell, so n = 3.
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