Q.Write a note on metallic nature of p-block elements.

Metallic (electropositive) character is an element's tendency to lose electrons and form a cation. It is governed directly by ionisation energy: the lower an element's ionisation energy, the more readily it gives up an electron, and so the more metallic it behaves. Since ionisation energy generally falls on descending any group (the valence electron sits progressively farther from the nucleus and is shielded by more inner electrons), metallic character generally rises down a group.

Mapped across the whole p-block, this produces a clear diagonal split: elements toward the lower-left of the block are metals, and elements toward the upper-right are non-metals, with a diagonal band of metalloids -- elements with intermediate, part-metallic part-non-metallic properties -- running between the two. Group 13 is metallic throughout except for its very first member, boron, a metalloid whose small atomic radius and correspondingly high effective nuclear charge pull its electrons in too tightly for typical metallic behavio …