First slide
13th group or boron group

Which of the following statements is not true  


The stability of the +1 oxidation state increases down the group. This is because of the participation of only P-electron . The two S-electrons (S2) do not take part in the chemical reaction (Inert pair effect)
For example TlCl  more stable then  TlCl3 . Because In TlCl Tl+1 is more stable then Tl+3 due to  Inert Pair effect.

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