# An atom has 9 protons and 10 neutrons. What is the atomic number, the mass number and the symbol for this element?

We have ""^19Z, where the $\text{atomic number} = 9$.
The mass number is clearly $19$. You're on your own with the identity of the element. Do you think there could be a Table published somewhere that list elements according to their $\text{atomic numbers}$?