Why did Mendeleev leave gaps in his periodic table?
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because they are tin tabular form not in vertical form
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Mendeleev's periodic table is an arrangement of the elements that group similar elements together. He left blank spaces for the undiscovered elements (atomic masses, element: 44, scandium; 68, gallium; 72, germanium; & 100, technetium) so that certain elements can be grouped together.
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