The property that is the unique, defining property of atoms of a particular element is the atomic number. Hence, the answer is atomic number. Read below about atomic number
How can one describe the Atomic Number?
Every atomic element has its own ideal properties. Each contains a number of protons and neutrons different from one another, having its own atomic number and mass number. The atomic number of an element is equal to the number of protons that element contains.
Therefore, the correct answer is as given above
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