Respuesta :
The atomic mass is 9 amu.
Given that,
- An atom with 4 protons, 5 neutrons, and 4 electrons.
Based on the above information, the calculation is as follows:
Atomic mass = Protons + neutrons
= 4 protons + 5 neutrons
= 9
Therefore we can conclude that the atomic mass is 9 amu.
Learn more: brainly.com/question/11673503