Which of the following does not increase while moving towards higher groups?

Periodic properties of chemical elements reoccur periodically. This is the basis of creation of periodic table. In the classification of elements, elements show a periodic trend in many properties. The main basis of classification of these elements is increasing atomic number, which represents increasing positive charge in the nucleus. Negatively charged electrons are arranged in orbitals around the nucleus. The recurring properties of these elements are due to recurring configurations of these electrons in the orbitals around the nucleus.