The periodic classification and the problem of chemical evolution / by George Rudorf.
- Rudorf, George.
- Date:
- 1900
Licence: In copyright
Credit: The periodic classification and the problem of chemical evolution / by George Rudorf. Source: Wellcome Collection.
90/252 page 70
![Carnelley.—In 1890 the late Professor Carnelley published an interesting paper1 in which he showed that the atomic weights might be represented with a tolerable degree of accuracy by the formula A = c(m+ Jv) where A is the atomic weight, m is a term of an arithmetical series depending on the group to which the element belongs, v is the number of the group, and c is a constant. Ex- cluding the elements of the first three series, the formula becomes A = c(3'5o.-h9+ Jv) where a is the number of the series, c is a constant, and has approximately the value 6-64. This is nearly the same as the value of the atomic heat. If this were so, then the specific heats should be given by the formula s = —■ This is found to be actually -r v v the case, although it may simply result accidentally from the particular choice of the units employed. Adkins.—In 1892 H. Adkins published a rela- tion between the atomic weights.2 He states that all the elements can be formed from the series 7 Li, 9 Be, 11 B and 12 C, in regular sequence by taking a basic number, which is either an alkali, an alkaline earth, or a mixture of the two, and adding this successively to each member of the .series. He claims for his scheme that it exhibits a degree of sequence of the atomic weights. The only exceptions are a small anomalous group, and a reduplication of 12 in the case of magnesium. 1 Phil. Mag. [5], 29, 27. 2 C. N. 65, p. 123.](https://iiif.wellcomecollection.org/image/b28105102_0090.jp2/full/800%2C/0/default.jpg)
