Question

An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of _____ amu.

(place a whole number)

Answer 1

9

Step-by-step explanation:

5 neutrons + 4 electrons = 9. We don't use protons in the calculation because the mass is so small that it can be ignored. Good luck ◕‿◕

Answer 2

9

Step-by-step explanation:

atomic mass = number of protons + number of neutrons = 4+5 = 9 amu