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which is the following represent the co...

which is the following represent the correct order of ionic radii?

A

`Al^(3+) gt Mg^(2+)gt Na^(+) gt O^(2-) gt F^(-)`

B

` O^(2-) gt F^(_) gt Na ^(+) gt Mg ^(2+) gt Al ^(3+)`

C

`Mg^(2+) gt Al^(3+) gt O^(2-) gt F ^(-) gt Na ^(+)`

D

`O^(2-) gt F^(-) gt Al^(3+) gt Mg^(2+) gt Na ^(+)`

Text Solution

Verified by Experts

The correct Answer is:
B
in `O^(2) gt F ^(-) gt Na ^(+) gt Mg ^(2+) gt Al ^(3+)`
All these ions have neon configration `ls^(2) ,2s ^(2),2p^(6)` but the different nuclear that is why they are isoelectronic spices( different species having the same numer and cofrigration of electronic ) , To understand the decrease in radius from `O^(2)- to Al^(3+)`. The ionic radii of isoelectronic species increases , With a decrease in magnitudes of nuclear charge.
Nuclear charge =8+9+11+12+13=
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