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17 December, 20:09

When Mendeleev started his work on organizing the elements, about how many had

been discovered?

about 10

well over 100

about 60

the same as today

+5
Answers (1)
  1. 17 December, 22:07
    0
    About 60.

    Explanation:

    Mendeleev knew of 63 elements. He wrote their properties on cards and arranged them in order of atomic mass.

    That's how he discovered that the properties of elements are periodic functions of their atomic masses.
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