Question

reasons for periodicity in properties

Answer 1

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The periodic repetition of the elements with similar properties after certainregular interval when atoms are arranged in increasing order of atomicnumber is called periodicity. The periodic repetition of the properties is due to the recurrence of the similar valence shell configuration aftercertain regular interval.

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Answer 2

cause of periodicity is the recurrence of similar electronic configuration,i.e having same no of electron in outermost orbit.