Exercise-2: Cations and Anions, Isoelectronic Series

Question:

Which of the following correctly lists the five atoms in order of increasing size (smallest to largest)?

  1. F < S < O < Mg < Ba
  2. O < F < S < Mg < Ba
  3. F < O < S < Mg < Ba
  4. F < O < S < Ba < Mg
  5. O < F < S < Ba < Mg


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