Number of Neutrons - An Atom determines an Element
The purest type of atom is called an element. Atoms are composed of three kinds of smaller particles, called protons, neutrons and electrons. The number of protons, the number of neutrons and the number of electrons an atom has determines what the element it is.
Number of Neutrons - How to find the Number of Neutrons
We can identify the number of neutrons in an atom or element by subtracting the atomic mass number from the atomic number.
Number of Neutrons = Mass Number - Atomic Number