Density is a Periodic Property: Discovering an Element—ChemTopic™ Lab Activity

After observing trends in the properties of the elements when arranged by increasing atomic mass, Dmitri Mendeleev proposed the periodic law and predicted the existence and properties of at least three undiscovered elements. With the Density is a Periodic Property: Discovering an Element—ChemTopic™ Lab Activity, measure mass and volume data for silicon, tin and lead; calculate their densities; and use the results to predict the density of germanium, Mendeleev’s “undiscovered” element.