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Atomic Radius

Assertion : ...

Question

Assertion : $M g^{2 +}$ and $A l^{3 +}$ are isoelectronic but ionic radius of $A l^{3 +}$ is less than of $M g^{2 +}$ Reason: The effective nuclear charge on the outershell electrons in $A l^{3 +}$ is more than that in $M g^{2 +}$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
For isoelectronic species the cation with the greater positive charge will have a smaller radius because of the greater attraction of the electrons to the nucleus. Anion with the greater negative charge will have the larger radius. In this case, the net repulsion of the electrons will outweigh the nuclear charge and the ion will expand in size.

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Similar questions

{Mg}^{2 +}

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Assertion: Be and Al have similar properties.

Reason: $B e^{2 +}$ and $A l^{3 +}$ have nearly the same charge/volume ratios and similar polarising power.

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