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Gallium and germanium (discovered later) were placed below aluminium and silicon in their respective groups. The names given by Mendeleev for Gallium and Germanium are Eka-aluminium and Eka-silicon. Similarly, the gap that he has left for the undiscovered element that comes after aluminium is given the name Eka-aluminium. 
  1. True
  2. False


Solution

The correct option is A True
Mendeleev predicted the existence of some elements that had not been discovered at that time and left some gaps in his periodic table. He named them by prefixing a Sanskrit numeral, Eka (one) to the name of preceding element in the same group. The gap that he has left for the undiscovered element that comes next to silicon is given the name Eka-silicon. 

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