why did mendeleev leave some gaps in the periodic table
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Mendeleev gave due importance to the chemical properties of elements.Therefore,he placed elements with similar properties one below the other and therefore ignored his own law at many places.This led him to leave gaps in the table.He left proper gaps in the periodic table for then undiscovered elements like titanium (Ti) , gallium(Ga), scandium(Sc) ,germanium(Ge).
When these elements where discovered later on,they were placed on those gaps without disturbing the existing arrangement.
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