CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


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+.
  1. Both assertion and reason are true. Reason is the correct explanation of assertion.
  2. Both assertion and reason are true. Reason is not the correct explanation of assertion.
  3. Assertion is false. Reason is true.
  4. Assertion is true. Reason is false.


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.

flag
 Suggest corrections
thumbs-up
 
0 Upvotes


Similar questions
View More


People also searched for
View More



footer-image