Final answer:
The element with 8 protons, 9 neutrons, and 8 electrons is Oxygen (O). Its mass number is 17, represented as 17O in standard notation and it is neutral.
Step-by-step explanation:
The symbol of the element that has 8 protons, 9 neutrons, and 8 electrons is O, which stands for Oxygen. The atomic number, also known as the number of protons in an atom, uniquely identifies an element and its position in the periodic table. In this case, 8 protons correspond to the element Oxygen.
The mass number of an atom is the sum of its protons and neutrons. For this element, the mass number would be 17 (8 protons + 9 neutrons). Using standard notation to represent the isotope of this element, it would be written as 17O. Since the atom has 8 electrons, it is neutral with no charge.