Which of the following sets of elements is wr | vedclass

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(A) Metallic character refers to the tendency of an element to lose electrons.In a group,metallic character increases as we move down because the atom

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$Be, Mg, Ca$

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(A) Metallic character refers to the tendency of an element to lose electrons.In a group,metallic character increases as we move down because the atomic size increases and the valence electrons are held less tightly by the nucleus.In a period,metallic character decreases from left to right because the atomic size decreases and the effective nuclear charge increases,making it harder to lose electrons.For option $A$: $Be, Mg, Ca$ are all in Group $2$. As we move down the group from $Be$ to $Mg$ to $Ca$,the metallic character increases.For option $B$: $Li$ is in Period $2$,while $Na$ and $K$ are in Period $3$ and $4$ respectively. The order $Na, Li, K$ is not increasing.For option $C$: $Mg, Al, Si$ are in the same period. Metallic character decreases from $Mg$ to $Si$.For option $D$: $C, N, O$ are in the same period. Metallic character decreases from $C$ to $O$.Therefore,the correct set is $Be, Mg, Ca$.

Which of the following sets of elements is written in the order of their increasing metallic character?

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