How to find the amount of neutrons in an element

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

Use A=P=E-M-A=N. Atomic number = number if protons = number of electrons, and atomic mass - atomic number = number of neutrons. So in order to find the number of neutrons, subtract the atomic number from the atomic mass (just round the atomic mass).

For example, potassium (K).
Atomic #: 19
Atomic Mass: 39

39 - 19 = 20

So, potassium has 20 neutrons.

Hope this helps!

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