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Why couldn't Mendeleev organize the entire periodic table during his research? Question options: The elements showed no periodic properties. The atomic number was unknown at the time. Some elements were undiscovered at the time. The atomic mass was unknown at the time.

User Egekhter
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Answer:

Correct Answer:

Some elements were undiscovered at the time.

Explanation: This is straight from the test.

User Amulya Acharya
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Pretty sure that some elements were discovered at the time is correct.
User Tea With Cookies
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