Multiple choice

The cause of periodicity in the periodic table is

  1. atomic orbitals

  2. atomic mass

  3. atomic number

  4. electronic configuration
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D Correct answer
Explanation

 The recurrence of characteristic properties of elements, arranged in the periodic table at regular intervals, is called periodicity. Elements having similar electronic configuration have similar properties. Thus the cause of periodicity is the repetition of similar electronic configuration.

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