![Which of the following defines the Mass number of an atom?](https://www.gkseries.com/blog/wp-content/uploads/2022/01/Which-of-the-following-defines-the-Mass-number-of-an-atom.png)
Q. Which of the following defines the Mass number of an atom?
A. number of protons + number of electrons
B. number of neutrons + number of electrons
C. number of protons + number of neutrons
D. number of electrons
Answer: number of protons + number of neutrons