Explain periodicity of elements and also explain it's causes it's urgent don't copy from google please give me correct answer.

Explain periodicity of elements and also explain it's causes it's urge

1.	Explain periodicity of elements and also explain it's causes it's urgent don't copy from google please give me correct answer.
Answer» ements are ARRANGED in of their atomic number in the PERIODIC table, a REPETITION in PROPERTIES after a is observed.This of properties is KNOWN as periodicity of properties of elements.❤️