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jp:
The question marks indicate places where there was no known element whose _____________ fit the pattern. Dmitri predicted that new elements would be discovered that would fill those gaps.
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mdobbs6856:
Do you have answer choices?
mdobbs6856:
If you read more on Dmitri Mendeleev you might find the answer
mdobbs6856:
@jp
Trios:
Answer choices or?
jp:
there are no answer choices
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