Before Mendeleev published his periodic table, Dbereiner
Chapter 8, Problem 8.3(choose chapter or problem)
Before Mendeleev published his periodic table, Dbereiner grouped elements with similar properties into triads, in which the unknown properties of one member could be predicted by averaging known values of the properties of the others. To test this idea, predict the values of the following quantities: (a) The atomic mass of K from the atomic masses of Na and Rb (b) The melting point of Br2 from the melting points of Cl2 (101.0 C) and I2 (113.6 C) (actual value ? 7.2 C)
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