Respuesta :
The mass number is the sum of protons and neutrons. In this case it would be 17.
Answer:
The atomic mass is: 17
Explanation:
Hello! Let's solve this!
The atomic mass is the sum of the number of protons and neutrons in the nucleus of the atom. The electrons do not count because they are not present in the nucleus.
In this case there are 8 protons and 9 neutrons. The mass is:
8 + 9 = 17
We conclude that the atomic mass is: 17
