What did Dmitri Mendeleev create that greatly aided other scientists in understanding the relationships among the elements?

• A. The electron cloud model
• B. The atomic theory
• C. The law of conservation of mass
• D. The periodic table of elements

Answer: (D)

Verified step by step guidance

1. Recognize that Dmitri Mendeleev is historically known for organizing elements based on their properties.
2. Understand that Mendeleev arranged elements in a table format where elements with similar chemical properties are grouped together.
3. This arrangement allowed scientists to see patterns and predict properties of elements that had not yet been discovered.
4. The creation that Mendeleev developed is called the periodic table of elements, which organizes elements by increasing atomic mass and recurring chemical properties.
5. Note that this periodic table greatly aided scientists by showing relationships among elements, unlike the electron cloud model, atomic theory, or law of conservation of mass.