Table of the Nuclides This is a convenient way to find out a nuclide by either starting with the chart of the nuclides or by simply typing in the symbol. Periodic Table - WebElements Welcome to the beta test version 8 of WebElements 2. By popular demand, you can choose between two parallel versions of WebElements. One uses a "frames" interface while the other does not. Physical Constants and Astronomical Data Fundamental Physical Constants This document gives the values of the basic constants and conversion factors of physics and chemistry resulting from the 1986 least-squares adjustment of the fundamental physical constants as published by the CODATA Task Group on Fundamental Constants and as recommended for international use by CODATA.