Answer:
Arranging the
given elements into different groups and periods in order of there increasing
atomic numbers.
So, we have
Group number 121814
Third period
:?Mg ??
Fourth
period :K CaGaGe
Since, the
metallic character decreases along a period from left to right, therefore,
metallic character increases in the order: Ge < Ga < Ca < K (as all
these belong to same period).
Now we
compare the metallic character of Ca and Mg. Since, metallic character
increases down the group from top to bottom, therefore, Ca is more metallic
than Mg.
Combining
the above two results, the overall metallic character increases in the order
Ge < Ga <
Mg < Ca < K.
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