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The +1 oxidation state is more stable than the +3 oxidation state for thallium.why? 

it is bydue to the poor screening effect of d&f orbital found in thallium.due to this the atractive forse of necleus to the outer (s&p)electronsare much greater.so the only one p- electonejects from the atom.this is the reason for the +1oxidation state of thallium.

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 The +3 oxidation state does not necessarily have high oxidising character for all the elements. When we consider group 13 elements, we find that the heavier members of the group show both +1 and +3 oxidation states. However, the stability of +1 oxidation state increases from Ga to Tl. In other words, the +1 oxidation state is more stable for Tl than the +3 oxidation state. So Tl+3 ion has a high tendency to get converted into the more stable Tl+1 ion. Thus in a reaction, it will readily accept electrons and get reduced to the Tl+1 ion, thereby oxidising the other reactant. This is why it has high oxidising character.

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Due to inert pair Effect
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thallium shows 1 oxidation state than 3
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We know that stability of higher oxidation state (+3) decreases and stability of lower oxidation state (+1) increases, so thallium is most stable in its +1 oxidation state due to the inert pair effect and paired s electrons.
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You are a cocksucker
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