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Chemistry · Classification of Elements and Periodicity in Properties
हिन्दीWhich of the following species has the largest size and which has the smallest size among \( \text{Mg}, \text{Mg}^{2+}, \text{Al}, \text{Al}^{3+} \)?
Correct answer · Option 1
Largest: \( \text{Mg} \), Smallest: \( \text{Al}^{3+} \)
Explanation
Atomic radius decreases across a period (\( \text{Mg} > \text{Al} \)), and cations are much smaller than parent atoms due to loss of shell and high positive charge (\( \text{Al}^{3+} < \text{Al} \)). Thus Mg is largest and \( \text{Al}^{3+} \) is smallest.
