atomic_number()
atomic_number_isotope()
atomic_symbol()
most_common_mass()
find_index()
get_proper_hm_symbol()
spacegroup_get_hall()
spacegroup_get_hm()
spacegroup_get_number()
spacegroup_get_number_and_setting()
spacegroup_get_number_of_settings()
spacegroup_get_schoenflies()