How do you calculate the number of neutrons in an atom?

To calculate the number of neutrons in an atom, you need to know the atom's atomic number and atomic mass. Here are the steps:

1. Identify the atomic number of the atom. The atomic number is the number of protons in an atom, and it is unique to each element. It is usually listed on the periodic table.

2. Identify the atomic mass of the atom. The atomic mass is the total number of protons and neutrons in an atom. It is also usually listed on the periodic table.

3. Subtract the atomic number from the atomic mass. The result is the number of neutrons in the atom.

For example, if an atom has an atomic number of 6 (Carbon) and an atomic mass of 12, it has 6 neutrons (12-6=6).