What are the atomic weights of Aka Silicon and Germanium?

72, 72.6

The correct answer is option 1. 72, 72.6.

Mendeleev lived at an era before Germanium was found. As a result, he named it Aka Silicon and foresaw the characteristics of Germanium. He thus anticipated that the atomic weight of Germanium would be 72 whereas the atomic weight of Aka silicon was 70.