The recurrence of similar properties of the elements after regular intervals when they are arranged in the order of increasing atomic numbers is called periodicity. The classification of the elements in certain families was based upon the observed similarities in the physical and chemical properties. But, why do certain elements exhibit similar properties recur at regular intervals of atomic numbers were some important questions yet to be answered. Thus the main cause of the periodicity of the properties of the elements is the repetition of similar electronic configuration of their atoms in the outermost energy shell (or valence shell) after certain regular intervals. For example, all the alkali metals have a great tendency to lose the single electron in order to acquire a stable noble gas configuration. Consequently all of them are very reactive metals.
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