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The number of neutrons varies between different isotopes of the same element.

What is isotopes?
Isotopes
are atoms of the same element that have different numbers of neutrons in the nucleus. They are identified by the mass number, which is the sum of the protons and neutrons in the nucleus. Isotopes have the same number of protons as each other, but they have different numbers of neutrons. This causes them to have different atomic masses. Isotopes of the same element may also have different chemical properties. For example, two different isotopes of hydrogen, deuterium and tritium, have different chemical properties due to their different numbers of neutrons. Isotopes are used in a variety of applications, such as medical imaging, nuclear power, and carbon dating. They can also be used in research to study the behavior of atoms in different environments.

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