Periodicity In Atomic Properties

Periodic Properties of Class 11

In a period from left to right there is a regular change in electronic configuration of elements. In a group from top to bottom the outermost shell electronic configuration is similar. The chemical properties of the elements depend upon their electronic configuration. So there is a regular change in chemical properties in a period while in a group element have similar chemical properties. In a period as well as in a group there is a regular gradation (gradual increase or decrease in a particular property) in physical and chemical properties of elements with the change in atomic number. This regular gradation in properties is called periodicity and all these properties which are directly or indirectly related to the atomic structure or electronic configuration of the elements are called atomic properties. Periodicity in some atomic properties is discussed as under

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