How metallic properties change in the series Mg-Ca-Zn-Ba

Mg -> Ca -> Zn -> Ba

Note that the elements of group 2 of the main subgroup of the periodic system of Mendeleev, which are metals, are given. In a group (vertical column), the elements are arranged in the order of increasing not only their relative atomic masses, but also the number of electronic levels. And the more electronic levels in an atom, the easier it is to donate external electrons, occupying a stable eight-electron configuration. Consequently, the elements are located as their reducing properties increase, their metallic properties are enhanced, which can be confirmed experimentally by immersing each metal in water. Barium will react most intensively with water, displacing hydrogen from it.

Ba + 2H2O = Ba (OH) 2 + H2 ↑.