Chemistry · Modern periodic law and present form of the periodic table
Mendeleev arranged the known elements in a/an order of their atomic masses.
Mendeleev arranged the known elements in a/an order of their atomic masses.
- A. increasing
- B. decreasing
- C. random
- D. none of the above
Step-by-step solution
Mendeleev organized the known elements by increasing atomic mass, as the concept of atomic number was not yet established. He arranged them in rows (periods) and columns (groups) based on recurring chemical properties, sometimes inverting order to maintain consistency.
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