its according to the number of isotopes
The number of neutrons will vary for every isotope of an atom and is not possible to generalize for all the elements.
For each isotope the number of neutrons is different. Number of neutrons = Mass number of an Tc isotope - 43
A typical atom of iodine contains 74 neutrons.
In one atom of cobalt ion, the number of neutrons can vary based on the isotope. The most common isotope of cobalt is cobalt-59, which has 33 neutrons.
10 neutrons in Ne-20 isotope
117 neutrons in Pt-195 isotope.
16 neutrons in P-31 isotope
The stable isotope, Fluorine-19, has 10 neutrons.
There are 77 Neutrons in the nucleus of one atom of Xenon
30 neutrons in Ni-58 isotope.
The most common isotope , berkelium-249, has 152 neutrons.Number of neutrons = Mass number of an isotope - 97
The answer to how many neutrons an atom of an isotope has is always the difference between the mass number of the isotope and the atomic number of the element. The atomic number of krypton is 36. Therefore, an atom of krypton-82 has 46 neutrons.