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Modern Periodic Table

When Mendelee...

Question

When Mendeleev started his work , the work , the number of known elements was:

A

68

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B

53

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C

57

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D

63

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Solution

The correct option is A 68
When Mendeleev started the work, many elements were not even discovered . Example - noble gases
here only 68 element no is noble gas

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18

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