In 1869, Dmitri Ivanovitch Mendeléeff, Russian chemist, arranged all the elements in groups that show the mathematical progression of their atomic weights, predicted the existence of undiscovered elements which subsequent research found. Similarly, there was a square in the chemical crossword puzzle for radium, the properties of which were known before Madame Curie obtained that metal in a free state.
Of the 92 possible elements charted by Mendeléeff, five remained to be found until last week, when a German Curie, Dr. Ida Tacke of Berlin, assisted by Drs. Walter Noddack and Otto Berg, proclaimed...
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