Chemistry

Question

5. What property did Mendeleev use to organize the elements into a periodic table?

6. Is the following sentence true or false? Mendeleev used his periodic table to predict the

properties of undiscovered elements.

Answer

5. Mendeleev used atomic mass to organize the elements into a periodic table. 6. True.

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Mendeleev used atomic mass to organize the elements into a periodic table. He arranged the elements in order of increasing atomic mass and noticed that elements with similar properties appeared at regular intervals. This allowed him to predict the properties of undiscovered elements and fill in gaps in the table. Therefore, the sentence is true.