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What is the principal quantum number of the outermost electron in an atom of pot

Practice Questions

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

Questions & Step-by-Step Solutions

What is the principal quantum number of the outermost electron in an atom of potassium? (2022)
  • Step 1: Identify the atomic number of potassium, which is 19.
  • Step 2: Understand that the atomic number tells us the number of electrons in a neutral atom of potassium.
  • Step 3: Determine the electron configuration of potassium, which is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹.
  • Step 4: Look at the highest energy level (n value) in the electron configuration, which is 4 for the 4s¹ electron.
  • Step 5: Conclude that the principal quantum number of the outermost electron in potassium is n=4.
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