The atomic number (Z) is the number of protons in the nucleus of an atom. This number is unique to each element and determines its chemical properties. For example, any atom with 6 protons is Carbon, and any atom with 8 protons is Oxygen. No two elements have the same atomic number.
Which one of the following is the most characteristic property of an element?
Asked in UPSC CDS 1 2017 · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)
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