Final answer:
The chemical symbol for the element with the notation 80X35 is Br, which stands for bromine. The isotopes of bromine with 44 and 46 neutrons would be denoted as ^79Br and ^81Br, respectively.
Step-by-step explanation:
To identify the chemical symbol of an element with the notation 80X35, we look at the atomic number, which is given as 35. In the periodic table, the element with an atomic number of 35 is bromine, and its symbol is Br. When we refer to isotopes of bromine that have 44 and 46 neutrons, we use the standard notation that includes the mass number, which is the sum of protons and neutrons in the nucleus. Therefore, for an isotope with 44 neutrons, the mass number is 35 (protons) + 44 (neutrons) = 79, making the notation ^79Br. Similarly, with 46 neutrons, the mass number is 35 + 46 = 81, giving the notation ^81Br.