Abstract
IN Mr. Mallock's letter (NATURE, Feb. 19, page 276) he states that the periodicity of the hardness he determined does not fit Mendeléef's table. It is interesting to note that the hardnesses, and incidentally also the melting-points, fit rather well into the 18-period spectroscopic table which will be found on page v of the appendix of “Astronomy,” by Russell, Dugan, and Stewart. Inspection will show that the hard and soft metals are grouped and differentiated, and sequences with rather well-defined maxima and minima may be observed.
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KORFF, S. Hardness of Metals in Relation to Periodicity. Nature 119, 818 (1927). https://doi.org/10.1038/119818d0
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DOI: https://doi.org/10.1038/119818d0
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