In this book, therefore, he has attempted to provide a bridge by means of which the student of metallurgy may be led to an understanding of the general ideas on which the modern theory is based.

Often the data did not agree with their predictions. This meant that the model had to be changed. The modern atomic model is the result of many scientists building on each other's work.

The atomic number of tellurium is 52 and the atomic number of iodine is 53, so these elements are in the correct order in the modern periodic table.