Question

what is periodicity in the modern periodic table?

Answer 1

the word periodicity means recurring at regular interval.
In modern periodic table, similar elements get repeated after regular intervals.
These regular intervals are 2,8,8,18,18,32 and are called magic number..
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Answer 2

Repetition of properties after a certain interval is called periodicity of properties. If elements are arranged in increasing order of their atomic number in the periodic table, then elements repeat its properties after a definite interval. This repetition of properties is known as periodicity of properties.

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