Elements in the same period in the periodic table have the same

Elements in the same period in the periodic table have the same number of shells. A period is a row in the periodic table, and the number of shells an element has is determined by its position in the row. As you move from left to right in a period, the atomic number of elements increases, meaning that the number of protons in the nucleus also increases. This results in an increase in the number of electrons in the outermost shell, but the number of shells remains the same. Therefore, elements in the same period have the same number of shells, but different chemical and physical properties due to variations in their electron configurations.