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When Mendeleev started his work on perio...

When Mendeleev started his work on periodic classification of elements, only__________elements were known.

A

`30`

B

`63`

C

`50`

D

`70`

Text Solution

Verified by Experts

The correct Answer is:
B
In `1800`, only `31` elements were known. By `1865`, the number of identified elements become more than doubled to `63`.
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R SHARMA-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN ELEMENTS-Follow-up Test
  1. Lothar Meyer plotted a graph between the atomic volumes and atomic wei...

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  2. On the basis of the atomic volume curve, Lothar Meyer proposed that th...

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  3. When Mendeleev started his work on periodic classification of elements...

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  4. The formula of the hydrides and oxides formed by the various elements ...

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  5. Mendeleev's arranged the then known elements in horizontal rows and ve...

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  6. Mebdeleev's classification was a great improvement over contemporary t...

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  7. Which of the following elements were not known when Mendeleev publishe...

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  8. In Mendelev's modified periodic table, there arevertical column called...

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  9. In Mendeleev's periodic table group VIII containselements.

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  10. In Mendeleev's original periodic table, there were six horixontal rows...

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  11. Mendeleev's periodic table simplified and systematized the study of th...

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  12. One especially farishted feature of Mendeleev's accomplishment was his...

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  13. Mendeleev's propdicted the properties of unknown elements.

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  14. Mebdeleev's periodic table has helped in correcting the doubtful atomi...

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  15. The position of hydrogen in Mendeleev's periodic table is not fixed bu...

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  16. In Mendeleev's table, although most of the elements were placed in the...

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  17. Since its birth in 1869, the Mendeleev periodic table has been discuss...

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  18. The empirical evolution of the periodic table reached its peak in 1913...

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  19. Which of the following gives a straight line?

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  20. Which of the following correctely describes Moseley's law?

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