* Neutrons are identical particles: Neutrons are fundamental particles, meaning they're not made up of smaller components. All neutrons are exactly the same, with the same mass and charge.
* Isotopes: The number of protons in an atom defines its element. However, the number of neutrons can vary within an element. These variations are called isotopes. For example, carbon-12 has 6 protons and 6 neutrons, while carbon-14 has 6 protons and 8 neutrons.
In summary:
* It's not possible for the neutrons in an atom to be different from each other.
* The variations in the number of neutrons within an element create isotopes.
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