Multiple choice

What is the correct order of decreasing order of ion size from left to right?

  1. 0 2-, F-, Na+, Mg2+

  2. Mg2+, Na+, F-, 0 2-

  3. Na+, Mg2+, 0 2-, F-

  4. Mg2+, Na+, 0 2-, F-

  5. Na+, Mg2+, F-, 0 2-
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E Correct answer
Explanation

These are isoelectronic species, which have same number of electrons on each ion.In an isoelectronic series of ions, the nuclear charge increases with increasing atomic number and draws the electrons inward with greater force. The ion with fewest protons produces the mildest attractive force on electrons and thus has the biggest size.

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