This pie chart shows the distribution of elements among the four electron blocks: s-block, p-block, d-block, and f-block, based on which orbital their final electron occupies.

The d-block (transition metals) contains the most elements, followed by p-block (which includes nonmetals, metalloids, and post-transition metals). The s-block has only 14 elements (alkali metals, alkaline earth metals, hydrogen, helium), while the f-block contains 28 (lanthanides and actinides).