A) \[P\]
B) \[Si\]
C) \[Al\]
D) \[Mg\]
Correct Answer: D
Solution :
Element - Mg Al Si P Atomic radii \[\left( {\AA} \right)\]- 1.60 1.43 1.32 1.28 as we move across the period nuclear charge increases, hence, size decreases.
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