Periodicity in properties
''The repetition of similar electronic configuration after a definite period is the cause of periodicity of the properties of elements.''
It can be explained with the help of electronic arrangement of elements. According to the modern views, valency of the element can be indicated by the number of electrons present in the outermost orbit. The chemical properties of the elements are dependent on valency electrons. The variation in electronic arrangement leads to variation in the properties. After a specific interval, recurrence of similar electronic arrangement takes place when the number of valency electrons is the same. Therefore, there is a regular gradation and repetition in the properties of elements.
Periodic properties are directly or indirectly related to their electronic configuration and show a regular gradation on moving from left to right in a period or from top to bottom in a group. Some period are from top to bottom in the group. Some essential periodic properties are: shielding effect, ionization energy, atomic radii, oxidation number, electron affinity, density, electro-negativity, valency, melting point and boiling point.
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