Answer: Option (c) is the correct answer.
Explanation:
Mass number of an atom represents the number of protons and neutrons present in an atom. Whereas atomic number of an atom represents the number of protons.
For example, mass number of bromine is 80 g/mol and it's atomic number is 35.
That is, number of neutrons present in a bromine atom is as follows.
Mass number = Number of protons + number of neutrons
80 = 35 + number of neutrons
number of neutrons = 80 -35
= 45
Thus, we can conclude that bromine have 45 neutrons.
