Consider the isoelectronic species, Na+, Mg2+, F and O2-. The correct orderof increasing length of their radii is

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Answer is option b .Because Mg2+ have high nuclear charge therefore smallest size
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I hv chemistry teacher qualified CSIR -UGC-NET & GATE with all India rank -6 with 5 years tec exp...

In ur questions their is no F negative charge and all option it contains negative charge .consider their is negative charge then all element isoelecronic species .then look it's outer most shell Na+,mg++.behave like neon noble gas electronic configuration .then compare F&O atomic redia .imp trick...
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In ur questions their is no F negative charge and all option it contains negative charge .consider their is negative charge then all element isoelecronic species .then look it's outer most shell Na+,mg++.behave like neon noble gas electronic configuration .then compare F&O atomic redia .imp trick - Left to Right in periodic table reduces ionic radii ..... So ans should be -B read less
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