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Q.

Which one of the following has the highest size ?

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a

Mg

b

Mg2+

c

Al

d

Al3+

answer is D.

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Detailed Solution

Accordingly, the size of Mg is larger than Al in the periodic table, and we are aware that cations' sizes are always smaller than atoms'.

So, Mg has the largest size while Al3  has the smallest size.

Therefore, Option D is the correct answer.

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