Standard electrode potential values,$E^{\Theta}$ for $Al^{3+}/Al$ is $-1.66 \ V$ and that of $Tl^{3+}/Tl$ is $+1.26 \ V$. Predict the formation of $M^{3+}$ ion in solution and compare the electropositive character of the two metals.

(N/A) The standard electrode potential $(E^{\Theta})$ for $Al^{3+}/Al$ is $-1.66 \ V$,which indicates a high tendency for $Al$ to lose electrons and form $Al^{3+}$ ions in solution.
Conversely,the $E^{\Theta}$ for $Tl^{3+}/Tl$ is $+1.26 \ V$,which is a high positive value. This indicates that $Tl^{3+}$ has a strong tendency to gain electrons and be reduced to $Tl$.
Therefore,$Al^{3+}$ is stable in solution,whereas $Tl^{3+}$ is unstable and acts as a strong oxidizing agent.
Since $Al$ forms $Al^{3+}$ ions more easily than $Tl$ forms $Tl^{3+}$ ions,$Al$ is more electropositive than $Tl$.