elements are all from the first group of the periodic table
one_of_chemical_elements is not helium. one_of_chemical_elements is helium. each_element_in_periodic_table has number_associated_with each_element_in_periodic_table has not number_associated_with group_1_elements is not alkali_metals. group_1_elements is alkali_metals. list_of_elements is not list. one_of_chemical_elements is hydrogen. one_of_chemical_elements is not hydrogen. list_of_elements is list.