Given below are two statements :
Statement I : The correct order in terms of atomic/ionic radii is 
.
Statement II : The correct order in terms of the magnitude of electron gain enthalpy is 
.
In the light of the above statements, choose the correct answer from the options given below:
Text Solution
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Analyzing Statement I: The order given is 
. However, the correct atomic radii order should be 
because Mg is in group 2 (period 3) while Al is in group 13 (period 3), and moving right across a period decreases radius. The correct order would be 
. Therefore, Statement I is FALSE.
Analyzing Statement II: Electron gain enthalpy magnitudes follow Cl (highest, 
. This is because Cl has the highest tendency to gain an electron due to its position and electronic configuration. Statement II is TRUE.
Since Statement I is false and Statement II is true, the answer is option .
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