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What made Mendeleev certain that he should leave gaps in his table?
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What made Mendeleev certain that he should leave gaps in his table?

User Englund
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Answer:

Mendeleev left gaps in his periodic table because he knew that these elements existed, but had not yet been discovered. He believed that the elements would be eventually found and would fit perfectly into the gaps. Two such elements are Germanium and Gallium.

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User John Jefferies
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