Question

Mendeleev kept track of elements and their properties by arranging them with note cards.

Group of answer choices

True

Or

False

Answer 1

It is true, that Dmitri Mendeleev arranged elements using note cards to organize them by atomic mass and chemical properties, leading to the creation of the periodic table.

Step-by-step explanation:

• The statement that Dmitri Mendeleev kept track of elements and their properties by arranging them with note cards is true. When writing a chemistry textbook, Mendeleev organized the known elements of his time using note cards, which allowed him flexibility in arranging the elements based on their atomic mass and chemical properties.
• Moreover, he noticed that when arranged by increasing atomic mass, the elements showed a periodicity in their properties, which led to the creation of the periodic table. Mendeleev also left spaces for undiscovered elements on his table, predicting their existence and properties, which were later confirmed upon discovery, thus lending great credibility to his periodic table.
• Mendeleev had to occasionally list some elements out of the order of atomic mass to maintain the integrity of the groups, where elements with similar properties were aligned. This innovative approach allowed him to highlight the periodic nature of element properties.
• The ultimate acceptance of Mendeleev's periodic table came after the predicted elements were discovered and found to possess the properties he had anticipated, cementing his table as a cornerstone of modern chemistry.