Chemistry

Problem

Metals have few electrons in their valence shell while non-metals generally have more electrons in their valence shell. Metallic character is closely related to atomic radius and ionisation enthalpy. Metallic character increases from top to bottom in a group and decreases from left to right in a period of periodic table. Metallic character is inversely related to electronegativity of element. Considering the elements B, Al, Mg and K, the correct order of their metallic character is : a.

\text{B} > \text{Al} > \text{Mg} > \text{K}

\text{Al} > \text{K} > \text{B} > \text{Mg}

\text{Mg} > \text{Al} > \text{K} > \text{B}

\text{K} > \text{Mg} > \text{Al} > \text{B}

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