Final answer:
The Periodic Law explains the periodicity of elements' properties in the Periodic Table due to their atomic numbers or electronic configurations.
Explanation:
The Periodic Law states that the properties of elements are a periodic function of their atomic numbers or electronic configurations. This law was formulated by Dmitri Mendeleev in 1869 and led to the creation of the Periodic Table.
Mendeleev arranged the elements in the table based on their properties and atomic masses, leaving gaps for undiscovered elements. His approach allowed for the prediction of the properties of these yet-to-be-discovered elements.
Elements with similar properties are placed in the same vertical columns, known as groups, in the Periodic Table, showcasing the periodicity of elemental properties.
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