What's electron configuration of ions?

List four common ions with a valence electron configuration of Kr List the ions in the order of increasing atomic number Input format example N3- Hint two anions and two cations?

  • Answer:

    The lowest atomic number ion is Se^2-. The highest atomic number ion is Sr^2+. The ones in the middle are NOT Br^- or Rb^+. However, I do not know what the correct answer for those two is.

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