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What is the principal quantum number for the outermost electron in potassium (K)

Practice Questions

Q1
What is the principal quantum number for the outermost electron in potassium (K)?
  1. 2
  2. 3
  3. 4
  4. 5

Questions & Step-by-Step Solutions

What is the principal quantum number for the outermost electron in potassium (K)?
  • Step 1: Identify the element in question, which is potassium (K).
  • Step 2: Find the atomic number of potassium, which is 19.
  • Step 3: Write the electron configuration for potassium. It is [Ar] 4s1.
  • Step 4: Look at the last part of the electron configuration, which is '4s1'.
  • Step 5: The number before the 's' indicates the principal quantum number. Here, it is 4.
  • Step 6: Conclude that the principal quantum number for the outermost electron in potassium is 4.
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