The periodic table introduced by Meyer and Mendeleyev was the forerunner of the modern table of elements. A. Lord Rayleigh provided evidence that the structure of the periodic table limited the potential number of elements. B. Mendeleyev and Meyer organized the known elements into a chart that revealed periodic recurrences of chemical and physical properties. C. Mendeleyev's successful prediction of the properties of then- unknown elements lent support to the acceptance of the periodic law. D. Ramsay and Lord Rayleigh challenged the importance of the chemical research that Henry Cavendish had done a century earlier. E. Isotopes of a given element have exactly the same physical properties, but their chemical properties are slightly different. F. In the 1890's, Ramsay and Lord Rayleigh isolated argon and proposed the existence of a new series of elements.