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Standard X
Chemistry
Question

The number of elements known in Mendeleev's presented periodic table is:
  1. 50
  2. 90
  3. 63
  4. 102

A
63
B
102
C
90
D
50
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Solution
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In Mendeleev’s periodic table, elements were placed based on the atomic mass, and chemical properties. During Mendeleev’s work, only 63 elements were found. After studying the properties of all elements, he found that the properties of elements were related to atomic mass.

Hence, correct option is C.

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