Question

define periodicity write its cause​

Answer 1

hola mate!!!! your answer is here→

★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

Explanation:

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.