If a atom has 26 protons, 26 electrons, and 30 neutrons, what is its mass number?
56 and its Iron
To find the mass number of an atom, you need to add the number of protons and neutrons together. In this case, the atom has 26 protons and 30 neutrons. Therefore, you would add 26 and 30 together to get the mass number.
26 + 30 = 56
So the mass number of the atom is 56.