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How Can we explain higher stability of Bcl3 as compared to Tlcl3
@ shinaz in a group while coming down from top to bottom , due to increase in size and involvement of d and f orbital , the outermost ns2 electron are not shielded or have ineffective sheilding by d or f orbital , so, the s orbital electron remian paired and there increase a inert pair effect , due to which s orbital electron are not used in bonding and +1 oxidation state become more stable while +3 o.s doesnot stable . hence , first element boron show +3 o.s in bcl3 becomes stable while the last element of group thalium doesnot show a stable +3 o.s so, bcl3 is stable while ticl3 is unstable . HOPE IT HELPS ALL THE BEST
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