The properties of the alkaline earth metals group (2 A)
The alkaline earth elements
The alkaline earth elements are the metallic elements found in the second group of s-block after the group (1 A). They are located on the left side of the modern periodic table.
The alkaline earth metals are all shiny, silver-white and they are good conductors of the heat and the electricity.
The alkaline earth metals have similar properties, Their densities are higher than the alkali metals densities. All the alkaline earth metals sink in the water as they have higher densities than the water density.
The alkaline earth metals in the group (2) have two electrons in their valence shells. This enables the metals to easily lose the electrons which increases their stability and allows them to form the compounds. They are divalent elements as they have two electrons in their outermost energy levels.
The alkaline earth metals are reactive metals at standard temperature and pressure but the chemical activity of these elements is less than the alkali metals activity. therefore, they are not kept under the surface of the Kerosene or paraffin oil.
When we look in the modern periodic table, We will notice that the chemical activity of the alkaline earth metals increases as their atomic size increases as the loss of the two valency electrons become easier.
Barium (Ba) is more active than Calcium (Ca) which is more active than magnesium (Mg), All alkaline earth metals react with hydrogen to create metallic hydrides, they all react with oxygen to produce metal oxides, And they all react with halogens to form ionic halides.