The ionic radius of ion is Å. The ionic radii (in Å) of and , respectively are

Question

The ionic radius of  ion is  Å. The ionic radii (in Å) of  and , respectively are

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Strategy:
 Recognize the isoelectronic relationship between these ions. For ions with the same number of electrons, the radius is inversely proportional to the atomic number.

Step 1: Identify the species
All three () have 10 electrons.
- : . Radius .
- : .
- : .

Step 2: Predict values
As  increases, the nuclear pull increases, shrinking the radius.
-  must be smaller than . Expect value  (Standard: ).
-  must be smaller than . Expect value  (Standard: ).

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