The mass of an tom that contains 28 protons, 28 electrons and 34 neutrons is 62 amu
Explanation
The mass of the atom ( mass number ) is total number of protons + total number of neutrons.
The units of mass number is amu ( atomic mass units)
total number of protons= 28
total number of neutrons =34
mass of atoms is therefore = 28 + 34= 62 amu
