Final answer:
The chemical symbol for a hypothetical element with atomic number 119 and atomic mass 119 is 'Uue', standing for ununennium.
Step-by-step explanation:
The chemical symbol for an element with atomic number 119 and atomic mass 119 would be Uue. Each element's symbol is based on its Latin name or its placement in the periodic table, following the system set by IUPAC (International Union of Pure and Applied Chemistry). Since element 119 is not yet officially discovered or named, it currently goes by the placeholder name ununennium, which is represented by the symbol 'Uue'.