They react violently with water. Properties of elements in Group 2A, the alkaline earth metals The alkali metals are the elements Be, Mg, Ca, Sr, Ba, Rd. These elements have higher melting points than the alkali metals. They are harder and tougher. Magnesium is used to fabricate car parts like wheels.
Calcium reacts with water.
Magnesium clearly doesn't react with water or else it couldn't be used in car parts. The halogens, F, Cl, Br, I, At, are nonmetals. Halogens have lower melting points than the alkali metals. The noble gases, He, Ne, Ar, Kr, Xe, Ra, are nonmetals. The noble gases are very unreactive.