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Atomic size, valency, ionization enthalpy, electron gain enthalpy and electronegativity are the important periodic properties of elements. 

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Atomic size, valency, ionization enthalpy, electron gain enthalpy and electronegativity are the important periodic properties of elements. 

1. What do you mean by periodicity? 

2. Periodic properties are directly related to......

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1. The periodical repetition of elements with similar properties after certain regular intervals when the elements are arranged in the order of increasing atomic numbers is called periodicity,

 2. Electronic configuration.

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