What happens if you add a neutron to an atom?

if you add or subtract a neutron from an atom it will become a new isotopes of the same element

When you add a neutron to an atom you create a new isotope of the same element you had begun with. Neutrons do not carry an electric charge so it doesn't change the charge.

Explanation:

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.