Both Mg2+ and O−2 have 10 electrons each and they are isoelectronic species.
But the size of O−2 is greater than Mg2+ as size∝ez1
ezofMg2+=1012=1.2
ezofO−2=108=0.8
ez=NumberofelectronsNumberofprotons
JEE Main 2022 — Chemistry Inorganic Chemistry
Given below are two statements : one is labelled as Assertion and the other is labelled as Reason.
Assertion: The ionic radii of O2− and Mg2+ are same.
Reason: Both O2− and Mg2+ are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below.
Held on 27 Jun 2022 · Verified 6 Jul 2026.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Assertion is true but Reason is false.
Assertion is false but Reason is true.
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