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Arrange the following ions in order of t...

Arrange the following ions in order of their decreasing ionic radii.
`Li^(o+), K^(o+), Mg^(2+), Al^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
`Al^(3+) lt Mg^(2+) lt Li^(o+) lt K^(o+)`
`Al^(3+) lt Mg^(2+) lt Li^(o+) lt K^(o+)`
`Al^(3+)` and `Mg^(2+)` are isoelectronic ions.
In isoelectronic species, as the number of protons (atomic number) goes on increasing, size goes on decreasing due to stronger attraction on the electrons. `K^(o+)` is larger than `Li^(o+)` because on moving down the group, size decreaases.
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