Which has the smallest size [MP PET 1999]

1.	Which has the smallest size [MP PET 1999]
A.	\[N{{a}^{+}}\]
B.	\[M{{g}^{2+}}\]
C.	\[A{{l}^{3+}}\]
D.	\[{{P}^{5+}}\]
Answer» E.

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Which has the smallest size [MP PET 1999]

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