Question

Considering the elements B, Al, Mg and K, the correct order of their metallic character is: 

(a) B > Al >Mg > K 

(b) Al > Mg > B > K 

(c) Mg > Al > K > B 

(d) K > Mg > Al > B

Answer 1

(d) K > Mg > Al> B

In a period, metallic character decreases as we move from left to right. Therefore, metallic character of I < Mg and Al decreases in the order: K > Mg > Al. However, within a group, the metallic character, increases from top to bottom. Thus, Al is more metallic than B. Therefore, the correct sequence of decreasing metallic character is K > Mg > Al > B,