Correct option is D
The correct answer is (d) Atomic Number.
- The Modern Periodic Table is based on the Atomic Number of elements.
Information Booster:
- Atomic Number is the number of protons in the nucleus of an atom.
- The Modern Periodic Table is arranged in order of increasing atomic number.
- This arrangement resolves anomalies present in Mendeleev's periodic table, which was based on atomic mass.
- Elements with similar properties recur at regular intervals or periods when arranged by increasing atomic number.
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