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How many principal electronic shells has an atom whose electronic configuration is ...

How many principal electronic shells has an atom whose electronic configuration is shown below? 1s22s22p63s1
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
  • A 1
  • B 2
  • C 3
  • D 4
  • E 11
Correct Answer: Option C
Explanation:

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