Final answer:
The periodic table is divided into s, p, d, and f blocks, corresponding to the filling of s, p, d, and f subshells in the elements' electron configurations.
Step-by-step explanation:
The periodic table is divided into four regions based on the electron configuration of elements. The s block consists of the first two columns on the left side of the table, where the s subshells are filled with electrons. The p block encompasses the right-most six columns, corresponding to the p subshells being occupied. The d block is located in the middle section and includes the 10 columns of transition metals, indicating the filling of the d subshells. Lastly, the f block is comprised of the 14-column section typically depicted below the main body of the table to avoid making it excessively long, representing the filling of the f subshells or the lanthanides and actinides.