The correct sequence which shows decreasing order of the ionic radii of the elements is
The correct sequence which shows decreasing order of the ionic radii of the elements is
A. `AI^(3+) gt Mg^(2+) gt Na^(+) gt F^(-) gt O^(2-)`
B. `Na^(+) gt Mg^(2+) gt AI^(3-) gt O^(2-) gt F`
C. `Na^(+) gt F^(-) gt Mg^(2+) gt O^(2-) gt AI^(3+)`
D. `O^(2-) gt F^(-) gt Na^(-) gt Mg^(2+) gt AI^(3-)`
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Correct Answer - D
For isoelectronic species, ionic radii `prop (1)/("nuclear charge")`.
So, correct order of ionic radii is `._(8)O^(2-) gt _(9)F^(-) gt _(11)Na^(+) gt _(12)Mg^(2+) gt _(13)AI^(3+)`
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