they are harder than alkali metals
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They both are highly reactive and are not found in nature in elemental state.
No. The alkali and alkaline earth metals are very reactive.
The alkaline earth metals are in the group 2 of the periodic table of Mendeleev.
All alkaline earth metals and their salts are reactive and they have a blue-print that identifies them as an alkaline earth metal but metals exist as metals, and salts as salts, with different structural compounds.
Beryllium, magnesium and barium are three more alkaline earth metals.