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Which is more stable among Tl^(+3) and T...

Which is more stable among `Tl^(+3)` and `Tl^(+1)`. Why?

Text Solution

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`Tl^(+1)` is more stable than `Tl^(+3)`. It is due to inert pair effect. With increase in size of atom in a group, the s-electrons present in the outermost orbit are reluctant in involving bond formation.
Hence, in thallium, only p-electron involves in bond formation.
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