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JEE Main Chemistry question

ChemistryThe p-Block ElementsJEE Main

Stability of Tl is maximum when its valency is

Answer: 1

Solution

Thallium belongs to group 13, where heavier elements show the "inert pair effect": the electron pair becomes increasingly reluctant to participate in bonding due to relativistic stabilisation, so the oxidation state becomes

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Question ID VK-133331