In which of the following,the elements Al, B, | vedclass

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(A) Metallic character is defined as the tendency of an element to lose electrons. It decreases along a period from left to right and increases down a

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$B < Al < Mg < K$

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(A) Metallic character is defined as the tendency of an element to lose electrons. It decreases along a period from left to right and increases down a group. Comparing the positions in the periodic table: $B$ (Boron) is in period $2$,group $13$. $Al$ (Aluminum) is in period $3$,group $13$. $Mg$ (Magnesium) is in period $3$,group $2$. $K$ (Potassium) is in period $4$,group $1$. Since metallic character increases down a group and decreases across a period,the order of increasing metallic character is $B < Al < Mg < K$.

In which of the following,the elements $Al, B, Mg$ and $K$ are correctly arranged in the increasing order of their metallic character?

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