the alkaline-earth metals react similarly because they all have the same number of electrons in their outer energy level. Which group contains the alkaline-earth meatals?
Group II
The alkaline-earth metals belong to Group 2 of the periodic table. This group is also known as Group IIA. It consists of beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
To determine which group contains the alkaline-earth metals, you can use the periodic table. The periodic table organizes elements based on their atomic number, which represents the number of protons in the nucleus of an atom. Group numbers on the periodic table indicate the number of electrons in the outermost energy level, also known as the valence electrons.
In the case of alkaline-earth metals, they have two valence electrons. This means that they belong to Group 2, which consists of elements with two valence electrons. These elements exhibit similar chemical properties due to the presence of the same number of electrons in their outer energy level.