Question
Given below are two statements:
Statement-I: The correct order in terms of atomic/ionic radii is $Al > Mg > {Mg}^{2 +} > {Al}^{3 +}$.
Statement-II: The correct order in terms of the magnitude of electron gain enthalpy is $Cl > Br > S > O$.
In the light of the above statements, choose the correct answer from the options given below:
Options
Solution
Correct order of size is $Mg > Al > {Mg}^{2 +} > {Al}^{3 +}$
Atomic size depends mainly upon $Z_{\text{effective~}}$ and shell number.
Generally on moving down the group electron affinity decreases and on moving across the period electron affinity increase.
In the periodic table Cl has maximum electron affinity. Halogen has higher electron affinity than Chalcogen.
$$Cl > Br > S > O $$
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