Which of the following does not have a noble gas electron configuration? (or Which of the following is not isoelectronic with a noble gas?)

Which of the following does not have a noble gas electron configuration?

Q. Which of the following does not have a noble gas electron configuration? (or Which of the following is not isoelectronic with a noble gas?)

  1. S2-
  2. Ba+
  3. Al3+
  4. Sb3-
  5. Sc3+

Answer: Ba+

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