Assertion: The first ionization energy of aluminium is lower than that of magnesium. Reason: The ionic radius of aluminium is smaller than that of magnesium.

Question

Assertion: The first ionization energy of aluminium is lower than that of magnesium. Reason: The ionic radius of aluminium is smaller than that of magnesium. (A) If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion (B) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion (C) If Assertion is true but the Reason is false (D) If both Assertion and Reason are false

Tardigrade Admin · Accepted Answer

The elements of group III have ns 2 n p1, configuration. Since p -electrons are held less tightly than s- electrons. The first I E of each element is low as compared to the first IE of alkaline earth metal.

Q. Assertion: The first ionization energy of aluminium is lower than that of magnesium.
Reason: The ionic radius of aluminium is smaller than that of magnesium.

If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion

If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion

If Assertion is true but the Reason is false

If both Assertion and Reason are false

The elements of group $III$ have $n s^{2} n p^{1}$ , configuration. Since $p$ -electrons are held less tightly than $s -$ electrons. The first $I E$ of each element is low as compared to the first $I E$ of alkaline earth metal.

Q. Assertion: The first ionization energy of aluminium is lower than that of magnesium. Reason: The ionic radius of aluminium is smaller than that of magnesium.