Question

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.

Answer 1

Answer: The correct answer is option (A).

Step-by-step 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)