how mandeleev predicted Sc ,Ge Ga
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Since the elements did'nt exist at the time when Mendeleev made his periodic table so he left some gaps in the table and gave the names eka-aluminum, eka-boron, and eka-silicon while were later discoverd as gallium (Ga), scandium (Sc), and germanium (Ge). He predicted their properties before they were discovered because of the periodic table and later his predictions were meant to be correct.
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