magnesium is a kind of substance
magnesium_ion is magnesium_atom. magnesium is alkaline_earth_metal. magnesium is not metallic_element. magnesium_nitrate is chemical_compound. one_of_chemical_elements is not magnesium. magnesium is not metal. one_of_chemical_elements is magnesium. magnesium_nitrate is crystal. magnesium is metallic_element. magnesium is metal.