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NEETChemistryClassification of Elements and Periodicity in Properties

What term did Mendeleev use to describe elements that were still undiscovered at the time he published his periodic table?

Options

  1. AMystery elements
  2. BUnknown elements
  3. CEka-elements
  4. DExotic elements

Correct answer

C. Eka-elements

Step-by-step solution

Mendeleev used the term "Eka-elements" to describe elements that were still undiscovered at the time he published his periodic table.

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