Letter | Published:

The Atomic Weight of Fluorine

Naturevolume 128page375 (1931) | Download Citation



THERE is a good deal of evidence from chemical sources that the atomic weight of fluorine is greater than 19.00. In recent years the ratio of sodium fluoride to sodium chloride has been determined by McAdam and Smith,1 who find the value 19.009. In addition, from the limiting density of silicon fluoride, Germann and Booth2 find the value 19.010, assuming that the atomic weight of silicon is 28.06. The only work which supports the value 19.00 is that of Moles and Batuecas3 on the limiting density of methyl fluoride. Since methyl fluoride is a difficult gas to prepare in a state of purity by the method employed by Moles, and since, moreover, his density determinations show divergences far in excess of the experimental error, we have recently carried out a redetermination of the limiting density, using the same microbalance method as that employed for xenon.4

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

    Carnegie Institution Report, No. 267, p. 47; 1918.

  2. 2

    Jour. Phys. Chem., vol. 21, p. 81; 1917.

  3. 3

    Jour. Chim. Phys., vol. 18, p. 353; 1920.

  4. 4

    NATURE, vol. 127, p. 970; 1931.

Download references

Author information


  1. The University, Leeds

    •  & W. CAWOOD


  1. Search for H. S. PATTERSON in:

  2. Search for R. WHYTLAW-GRAY in:

  3. Search for W. CAWOOD in:

About this article

Publication history

Issue Date



Further reading


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.