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Which is a true statement about Dmitri Mendeleev?
A. Mendeleev created the periodic table in the 1860s.
B. Mendeleev grouped the known elements into four categories: metals, nonmetals, gases, and earths.
C. Mendeleev identified the first 17 elements of the periodic table.
D. Mendeleev organized the elements of the periodic table in the order of decreasing mass.

Respuesta :

Answer: The correct answer is option (A).

Explanation:

  • Dmitri Mendeleev published periodic table in 1869.
  • In his periodic table he arranged the elements in the increasing order of their atomic mass.
  • His periodic table consist total 63 elements.
  • He grouped the element on the basis of similarity of chemical and physical properties of the elements.

Hence, the correct answer is option (A)

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