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

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B > Al > Mg > K

Al > Mg > B > K

Mg > Al > K > B

K > Mg > Al > B

answer is D.

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Detailed Solution

In a period as we move from left to right, metallic character decreases as atomic size decreases. where as in a group from top to bottom metallic character increases as atomic size increases.

Hence, correct order will be K>Mg>Al>B.

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