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Question

Assertion: Mg2+and Al3+ are isoelectronic but ionic radius Al3+ is less than that of Mg2+.
Reason: The effective nuclear charge on the outer-shell electrons in Al3+ is more than that in Mg2+.

A
Both assertion and reason are true. Reason is the correct explanation of assertion.
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B
Both assertion and reason are true. Reason is not the correct explanation of assertion.
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C
Assertion is true. Reason is false.
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D
Assertion is false. Reason is true.
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Solution

The correct option is A Both assertion and reason are true. Reason is the correct explanation of assertion.

Mg has the electronic configuration: [Ne]3s2 and Mg2+ cation has the same electronic configuration as of Ne. Likewise, Al has the electronic configuration of [Ne] 3s23p1 and Al3+ cation has the same configuration as of Mg2+. Hence, Al3+ and Mg2+ are isoelectronic species, that is, they have same number of electrons.

Al3+ has more protons compared to Mg2+. Hence, the effective nuclear charge (Zeff) of Al3+ is higher. Thus, the ionic radius of Al3+ will be smaller than Mg2+.

Therefore, both assertion and reason are true. Reason is the correct explanation of assertion.


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