How can you find the number of neutrons in an atom

- How can you find the number of neutrons in an atom using the periodic table
- How can you find out the number of neutrons in an atom
- How to find the number of neutrons in an element
- How to calculate the number of neutrons in an atom
- How to calculate number of neutrons in an isotope
- How to find number of protons neutrons and electrons
- How to find proton neutron and electron of an element