Shown in the middle of each block directly below the name of the element. The colour used indicates the physical state of the element under ordinary conditions: black for solids, green for liquids, and blue for gases.
The Atomic Weight.
Directly below the symbol for each element the atomic weight is shown in black. The values are taken from the official Report on Atomic Weights Cf. J. Amer. Chem. Soc. 84,4193 (1976). For elements not listed in the Report the mass number of the longest lived isotope is shown in brackets.