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Considering the elements B, Al, Mg, and ...

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

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d. In a period, metallic character decreases as we move from left to right. Therefore, metallic character of `K`,`Mg`, and `Al` decreases in order :`KgtMggtAl`. 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 `KgtMggtAJgtB`, i.e. option `(d)` is correct.
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