Question

The most stable oxidation state of thallium & bismuth are respectively:

• A. $+3,+3$
• B. $+1,+5$
• C. $+1,+3$
• D. $+1,+1$

Answer 1

Answer: (C)

$+1,+3$

This is due to inert pair affect because of this s orbital doesnot participate in the bond formation.Though it is in the valence shell and this affect increases as we move down the group.