Question -
The cause of periodicity of properties is:
Options:
A .  Increasing atomic radius
B .  Increasing atomic weights
C .  Number of electrons in the valency orbit
D .  The recurrence of similar outer electronic configuration
Answer: Option D : D The recurrence of similar outer electronic configuration is the reason for the periodicity of properties. Although Mendeleev discovered that properties were periodic and created a table enlisting the elements, he didn't know the reason behind this occurrence.
Submit Your Solution hear: