The elements in which the differentiating electron enters into a p-orbital of the valence shell is ___________.

The p block elements belong to groups 13 to 18 and they have the general outer electronic configuration ns²np¹ to ns²np⁶. This block includes noble gases, other non-metals, metalloids, and some metals.

Hence, the element in which the differentiating electron enters into a p -orbital of the valence shell is the p block.