How many elements were known when Mendeleev started his work on his periodic table?

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Solution

The correct option is D
63

When Mendeleev started his work, 63 elements were known.

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The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminium and eka-silicon. What names were given to these elements when they were discovered later on?

Q. Which of the following element(s) was/were not known when Mendeleev gave his classification?

How many elements were known at the time of Mendeleev?

Mendeleev predicted the existence of few undiscovered elements based on his periodic table.

Q. How many elements were known at the time of Mendeleevs classification of elements?

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How many elements were known when Mendeleev started his work on his periodic table?

The correct option is D 63 When Mendeleev started his work, 63 elements were known.

The correct option is D
63

When Mendeleev started his work, 63 elements were known.