How many groups, which reflects the number of electrons in the outermost orbitals, is the periodic table divided into?

Explanation

The periodic table is a system that organizes the elements according to the number of protons in the nucleus and the number of electrons in the outer electron shells (orbitals). These two properties play a crucial role in the chemical properties of each element, and correspondingly, there is a connection between an element's chemistry and its position in the periodic table. The system is depicted as a chart divided into groups (columns), periods (rows), and blocks.