Electropositive Character

How do the following properties of group 1 and group 2 elements vary with increase in atomic number? (i) Atomic and ionic radii (ii) Density (iii) Melting and boiling points (iv) Electropositive character Give suitable explanation for the variation in each case.

(a) Standard electrode potential value E^@ for Al^(3+)//Al is - 1.66 V and that of Tl^(3+)//Tl is + 1.26 V . Predict about the formation of M^(3+) ion in solution and compare the electropositive character of the two metals. (b) White fumes appear around the bottle of anhydrous aluminium chloride. Give reason. ( c) Boron is unable to form BF_(6)^(3-) ion. Explain.

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 about the formation of M^(3+) ion in solution and compare the electropositive.character of the two metals.

Which of the following elements represent highly electropositive as well as highly electronegative character in its period?

What is most electropositive halogen?