The first Ionisation Enthalpy for Thallium is ~ 590 KJ/mol whereas that for Indium is ~ 558 kJ/mol. But why is +1 oxidation state more stable for Tlthan In? What are the other criteria that explain the stable +1 oxidation state of Thallium?

  • $\begingroup$ What happens to $\ce{In+^1}$? How is it unstable? $\endgroup$ – Ivan Neretin Sep 5 '18 at 20:16
  • $\begingroup$ In+1 readily oxidises to In+3 . $\endgroup$ – vaishnu suresh Sep 10 '18 at 8:53

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