symbol to name name to symbol symbol to mass mass to symbol symbol to boiling_point boiling_point to symbol symbol to category category to symbol symbol to density density to symbol symbol to melting_point melting_point to symbol symbol to molar_heat molar_heat to symbol symbol to number number to symbol symbol to period period to symbol symbol to phase phase to symbol symbol to symbol symbol to symbol symbol to group group to symbol symbol to shells shells to symbol symbol to electron_configuration electron_configuration to symbol symbol to electron_affinity electron_affinity to symbol