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What is the principal quantum number of the outermost electrons in an atom of ch

Practice Questions

Q1
What is the principal quantum number of the outermost electrons in an atom of chlorine? (2022)
  1. 1
  2. 2
  3. 3
  4. 4

Questions & Step-by-Step Solutions

What is the principal quantum number of the outermost electrons in an atom of chlorine? (2022)
  • Step 1: Identify the atomic number of chlorine, which is 17.
  • Step 2: Determine the electron configuration of chlorine. It is 1s² 2s² 2p⁶ 3s² 3p⁵.
  • Step 3: Look at the highest energy level (n) in the electron configuration. The outermost electrons are in the 3rd shell (3s and 3p).
  • Step 4: Conclude that the principal quantum number (n) of the outermost electrons in chlorine is 3.
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