Due to uncertainty in the names of some of the elements, a question mark is indicated before the symbol in the Mendeleev's periodic table. What are such symbols?
shindebsp7srzx:
WRONG ANSWER, CAUSE MENDELEEV HAS LEFT THE BLANK PLACES FOR UNDISCOVERED ELEMENTS, NOT QUESTION MARK
They were predicted to exist but were not yet proven
Answers
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39
Some elements remain undiscovered during the time of Mendeleev. Thus, question mark indicates those undiscovered elements.
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4
Answer:
Some elements were not discovered during Mendeleev. So, for undiscovered elements he gave question mark symbol.
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