Question

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

Answer 1

We have `""^19Z`, where the `"atomic number"=9`.

Explanation:

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 `"atomic numbers"`?