Question

The atomic mass of an element whose atoms consist of eight protons, nine neutrons, and eight electrons is _____. (Ignore the periodic table entry for this element and only consider what the atomic mass would be given the number of subatomic particles in this question).

Answer 1

Atomic mass by definition is the number of protons and neutrons.
We have eight protons and nine neutrons therefore the atomic mass must
be 17.

Hope this helps :).