Answer :
When one of the undiscovered elements predicted by a gap in Mendeleev's periodic table was discovered a few years after the chart was released, Mendeleev's work was validated.
What is Mendeleev's Periodic Table ?
The elements are organized into groups according to similarity in Mendeleev's periodic table. There were 63 elements in Mendeleev's periodic table. Mendeleev's periodic chart organizes the elements according to their atomic mass, but the Modern Periodic Table does it according to their atomic number. This is the fundamental distinction between the two periodic tables. The gaps that Mendeleev left in his table were one of its distinctive features. He not only predicted the existence of yet-undiscovered elements at these places, but also their atomic weights and other properties. When one of the undiscovered elements predicted by a gap in Mendeleev's periodic table was discovered a few years after the chart was released, Mendeleev's work was validated.
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