Mendeleev kept vacant places in the periodic table.
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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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Explanation:
Mendeleev had kept some vacant places in the periodic table for elements that were yet to be discovered . Three of these unknown elements were given the names eka-boron, eka- aluminium and eka-silicon from the known neighbours and their atomic masses were indicated as 44,68 and 72 , respectively.
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