What is the electronic configuration of an element represented as 199X?

What is the electronic configuration of an element represented as 199X?
  • A.
    1s 22s2 2p 5
  • B.
    1s22s23s23p3
  • C.
    1s2 2s2 2p 33s2
  • D.
    1s 22s22p 63s23p64s 1
Correct Answer: Option A
Explanation
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