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  • The ionic radius of Na+ ion is 1.02 . The ionic radii (in ) of Mg2+ and Al3+ respectively, are :Option: 1 0.72 and

The ionic radius of Na+ ion is 1.02 \AA. The ionic radii (in \AA) of Mg2+ and Al3+ respectively, are :
Option: 1 0.72 and 0.54
Option: 2 0.85 and 0.99
Option: 3 1.05 and 0.99
Option: 4 0.68 and 0.72

Answers (1)

best_answer

All ions have 10 electrons each.

But the Number of protons is 11, 12 and, 13.

So, more proton, more attraction towards left electrons inside the atom, more shrink will happen and become smaller.

So, ionic radii order: Na+ > Mg2+ > Al3+  

For 0.72 and 0.54 the order will be

  1.02 > 0.72 > 0.54  it is correct.

Therefore, the Correct option is (1)

Posted by

Kuldeep Maurya

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