Question

What is the cause of periodicity is modern periodic table ?.
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.CBSE​

Answer 1

Causes of periodicity : Similarity in the electronic configuration of valence shell of elements is the main cause of periodicity. Atomic number is the fundamental property of the elements. Similar elements are repeated at a regular interval When they arranged in the Increasing order of their atomic Number.

Answer 2

Answer:

mai bhi thik hu .

good morning.

have a nice day.

or apne mujhe pehchana ki mai kon hu .