The amount of neutrons varies, but they all have the same number of protons.
They are known as isotopes. Isotopy refers to the presence of two or more atoms of the same element that have the same atomic number but have distinct masses as a result of the varied numbers of neutrons present in their respective nuclei.
The quantity of protons in an atom determines its atomic number. It is equal to the number of electrons for a neutral atom.
The quantity of protons and neutrons in an atom is known as the mass number.
These are all 16-atomic-number isotopes.
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