Question

What is the mass number of the isotope of manganese (Mn) containing 28 neutrons?

Answer 1

The mass number consists of protons and neutrons. Since the element is an isotope of manganese, it needs to have the same number of protons as manganese. So the mass number is no of protons + number of neutrons = 25 + 28 = 53

Answer 2

Explanation:

Atomic number of manganese is 25 and it is known that atomic number means the number of protons present in an element.

Whereas mass number means the sum of total number of protons and neutrons present in an element.

Therefore, calculate the mass number of the isotope of manganese as follows.

                 Mass number = no. of protons + no. of neutrons

                                         = 25 + 28

                                         = 53

Thus, we can conclude that 58 is the mass number of the isotope of manganese (Mn) containing 28 neutrons.