Class/Course - Engineering Entrance

Subject - Chemistry

Chapter - Periodicity of Elements

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Q.1 Ce3+, La3+, Pm3+ and Yb3+ have ionic radii in the increasing order as
  La3+, Ce2+ < Pm3+ < Yb3+
  Yb3+ < Pm3+ < Ce3+ < La3+
  La3+ < Ce3+ < Pm3+ < Yb3+
  Yb3+ < Pm3+ < La2+ < Ce2+