alkaline earth metals are highly chemically reactive
alkaline_earth is metallic_element. arsenic_acid is not chemically_acidic_substance. pure_iron is not very_reactive_chemically. arsenic_acid is chemically_acidic_substance. hydrogen_metal is alkali. calcium is alkaline_earth_metal. alkaline_earth is not metallic_element. pure_iron is very_reactive_chemically. hydrogen is very_reactive. hydrogen_metal is not alkali.