1.

Names were given to gallium and germanium by mendeleev because he thought that these elements will have similar properties as that of aluminium and silicon ,respectively.

Answer»

blank spaces for the UNDISCOVERED elements (atomic MASSES, ELEMENT: 44, scandium; 68, gallium; 72, germanium; & 100, technetium) so that certain elements can be grouped together. However, Mendeleev had not predicted the noble gases, so no spots were left for them.



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