According to what property did Dmitri Mendeleev arrange the elements in his original periodic table?

• A. Increasing atomic mass
• B. Increasing atomic number
• C. Alphabetical order of element names
• D. Decreasing electronegativity

Answer: (A)

Verified step by step guidance

1. Recall the historical context of Dmitri Mendeleev's periodic table, which was developed before the discovery of the atomic number.
2. Understand that Mendeleev arranged elements based on a property that was measurable and known at the time, which was the atomic mass of the elements.
3. Recognize that Mendeleev noticed patterns in the properties of elements when they were ordered by increasing atomic mass, leading to the periodic law.
4. Note that the concept of atomic number was introduced later, refining the periodic table, but Mendeleev's original arrangement was based on atomic mass.
5. Conclude that the correct property Mendeleev used to arrange elements in his original periodic table is increasing atomic mass.