What do you understand by the term periodicity? Does the periodicity in properties is a functionof valence electrons? Illustrate.

What do you understand by the term periodicity? Does the periodicity i

1.	What do you understand by the term periodicity? Does the periodicity in properties is a functionof valence electrons? Illustrate.
Answer» Solution : When the elements are arranged in ORDER of INCREASING atomic numbers, elements with similarchemical properties are repeated at definite intervals. This is known as periodicity. Yes, this periodicity is due to the periodicity in the number of ELECTRONS in the outermost shell of the atoms of the elements. If elements having the same number of valence electrons are GROUPED together, theelements falling within each group are similar in CHEMICAL properties.