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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 electron in potassium (K)?
  1. 3
  2. 4
  3. 5
  4. 2

Questions & Step-by-Step Solutions

What is the value of the principal quantum number (n) for the outermost electron in potassium (K)?
Correct Answer: 4
  • Step 1: Identify the element in question, which is potassium (K).
  • Step 2: Look up the atomic number of potassium, which is 19.
  • Step 3: Determine the electronic configuration of potassium. It is [Ar] 4s1.
  • Step 4: Analyze the electronic configuration. The '4' in '4s1' indicates the principal quantum number (n) for the outermost electron.
  • Step 5: Conclude that the value of the principal quantum number (n) for the outermost electron in potassium is 4.
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