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What is the value of the principal quantum number (n) for the outermost electron

Practice Questions

Q1
What is the value of the principal quantum number (n) for the outermost electrons in a sodium atom?
  1. 1
  2. 2
  3. 3
  4. 4

Questions & Step-by-Step Solutions

What is the value of the principal quantum number (n) for the outermost electrons in a sodium atom?
Correct Answer: 3
  • Step 1: Identify the atomic number of sodium, which is 11.
  • Step 2: Write the electron configuration for sodium, which is 1s² 2s² 2p⁶ 3s¹.
  • Step 3: Look at the highest energy level in the electron configuration, which is 3s.
  • Step 4: Determine the principal quantum number (n) for the outermost electrons, which corresponds to the highest energy level, n=3.
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