The BasicsEdit

You are expected to know very little about neutrons except that they are found in the nucleus, that they have a relative charge of 0, and a mass of 1 atomic mass unit.

In Physics you may be taught that Protons and Neutrons have slightly different mass but this is of no consequence in Chemistry at this stage.

Adding neutrons to an atom does not change its chemistry. It will react in the same way (and so is the same element) but will be a little heavier - it is an isotope.