Question

Which of the following has the largest radius?

A
Sr
B
P
C
Mg
D
Al3+
E
Mg2+

Solution

The correct option is A $$Sr$$Cations are smaller than the corresponding neutral atoms formed by the loss of electrons, since the valence electrons, which are furthest away from the nucleus, are lost. These have smaller radius than the neutral atom. Since the atomic radius decreases in a period but increases down the group so Sr of group II and period V is largest in size.Chemistry

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