An element has an atomic number of 54 and contains 25 neutrons. What is the elements atomic mass?
A. 54 amu
B. 25 amu
C. 29 amu
D. 79 amu

The answer would most likely be 79 amu or 29 amu if you read a lesson on it it should tell you whether to add or subtract i took this class 3 years ago so i am a little foggy but either C or D is correct. Hope this helps!

Explanation:

answer ( groundwater);