elements from the same group in the periodic table are chemically reactive in a similar way
one_of_chemical_elements is not helium. one_of_chemical_elements is helium. one_of_chemical_elements is oxygen. element is chemical_substance. decomposition is chemical_reaction. chemical_decomposition is not chemical_reaction. reactant is chemical. helium is chemical_element. one_of_chemical_elements is not oxygen. chemical_decomposition is chemical_reaction.