Question

What is the nuclear symbol for the isotope of gallium, `Ga`, that contains 40 neutrons per atom?

Answer 1

`""^71Ga`

Explanation:

The atomic no. `Z` for `Ga=31`; given the `Ga` symbol, `Z` has been specified. This isotope contains 40 neutrons in its nucleus; thus we write the isotope as `""^71Ga`.