How many principal electronic shells has an atom whose electronic configuration is shown below? 1s22s22p63s1

How many principal electronic shells has an atom whose electronic configuration is shown below? 1s22s22p63s1
  • A.
    1
  • B.
    2
  • C.
    3
  • D.
    4
  • E.
    11
Correct Answer: Option C
Explanation
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