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NEET levelSingle correct optionDifficulty 1 of 3pt213

Which is the most stable oxidation state of thallium?

A $+ 1$
B $+ 2$
C $+ 3$
D $+ 5$

Answer: A

Thallium is the heaviest group 13 element, so its

6 s^{2}

electrons behave as an inert pair. Only the

6 p^{1}

electron is lost easily, which makes

+ 1

more stable than the group oxidation state

+ 3

.

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