how mandeleev predicted Sc ,Ge Ga
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Based on gaps in the periodic table Mendeleev deduced that in these gaps belonged elements yet to be discovered. ... Based on other elements in the same group he predicted the existence of eka-aluminum, eka-boron, and eka-silicon, later to be named gallium (Ga), scandium (Sc), and germanium (Ge).
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based on repetition of properties of elements
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