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Periodic Table and Periodicity: Modern periodic law MCQ

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Modern periodic lawEasyQuestion 840001

Question

The modern periodic law states that properties of elements are periodic functions of their:
  1. A
    Atomic number (Z)
    Correct
  2. B
    Atomic mass
  3. C
    Number of neutrons
  4. D
    Valence electrons only

Correct answer

Atomic number (Z)

Explanation

Modern Periodic Law (Moseley): properties of elements are periodic functions of their atomic number (Z), not atomic mass. This resolved anomalies in Mendeleev's table (e.g., Ar/K, Co/Ni, Te/I).

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