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Mendeleev predicted the existence of gallium and:
ATechnetium
BGermanium
CGadolinium
DMolybdenum
Answer & Solution
Correct answer: B. Germanium
1. He left a gap under aluminium and another under silicon.
2. He predicted the elements that would fill them.
3. These turned out to be gallium and germanium.
_Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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