Answer :

Ge < Ga < Mg < Ca < K


The metallic character decreases from left to right in a period. All the above elements, except Mg, are placed in the same period so the metallic character will decrease from K to Ge and order of metallic character would be Ge < Ga < Ca < K


As we move down in a group, metallic nature of elements increases. So, Ca is more metallic than Mg. Similarly, Mg will be less metallic than K because in period, metallic nature decreases from left to right. Hence the increasing order of metallic character would be


Ge < Ga < Mg < Ca < K


The arrangement of some of these elements in the Modern Periodic table is shown as below.



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