Elements for which mendeleev had left space in its periodic table
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Gallium, germanium, scandium and technetium are the elements which he left spaces as these all elements were unknown till 1871.
He predicted the atomic masses and chemical properties for the undiscovered elements.
Eka-boron (scandium)
Eka-aluminium (gallium)
Eka-manganese(technetium)
Eka-silicon (germanium)
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Germanium scandium and gallium
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