Which of the following electron configurations indicates an atom with the highest ionization energy?

Which of the following electron configurations indicates an atom with the highest ionization energy?
  • A.
    2,8,7
  • B.
    2,8,8,1
  • C.
    2,8,8,2
  • D.
    2,8,8,7
Correct Answer: Option A
Explanation
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