The periodic table is divided into blocks based on the subshell being filled with electrons. Metals are elements that lose electrons to form positive ions. The d-block contains the transition metals, which are all metallic. While s-block (groups 1-2) are also metals, the d-block has 10 groups (3-12) compared to the s-block's 2 groups. The f-block contains lanthanides and actinides, which are also metals, but the d-block has more groups and therefore a greater total number of elements.

Final Answer: d-block