magnesium is a kind of substance
magnesium is metallic_element. one_of_chemical_elements is magnesium. magnesium is alkaline_earth_metal. magnesium_ion is magnesium_atom. magnesium_hydroxide is chemical_compound. magnesium is metal. magnesium_nitrate is chemical_compound. magnesium is unalloyed_metal. magnesium_nitrate is ionic_compound. magnesium_nitrate is crystal.