Give the location of the elements found in the periodic table which have the same number of shells.?

Elements in the Periodic Table that have the same number of shells are located in the same period (horizontal row). For instance, all elements in Period 2 (like lithium, beryllium, and boron) have two electron shells, while those in Period 3 (like sodium, magnesium, and aluminum) have three shells. The number of shells corresponds to the period number, with each successive period adding an additional shell.