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A group of ions are given below: Na^+,...

A group of ions are given below:
`Na^+`, `Al^3+`, `O^2-`, `Ca^2+`, `Mg^2+`, `F^-`, `N^3-`, `Br^-`
a) Find the pair which is not isoelectronic.
b) Arrange the above ions in the increasing order of size.

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