Geometrical illustrations of Newlands' and Mendelejeff's periodic law of the atomic weights of the chemical elements / by Samuel Haughton.

  • Samuel Haughton
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: Geometrical illustrations of Newlands' and Mendelejeff's periodic law of the atomic weights of the chemical elements / by Samuel Haughton. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    XII. GEOMETEICAL ILLUSTRATIONS OF NEWLANDS’ AND MENDELEJEFF’S PERIODIC LAW OF THE ATOMIC WEIGHTS OF THE CHEMICAL ELEMENTS. By REY. SAMUEL HAUGHTON, M.D. (Plates IY.-YIII.) [Abstract.] PART I.—THE FIRST AND SECOND PERIODS OF SEVEN ELEMENTS FOLLOWING HYDROGEN; OR, TEE CARBON-SILICON DOUBLE PERIOD. [Read April 28, 1888.] I assume on the part of my readers a general knowledge of Newlands’ Law of Octaves, of Mendelejeft’s Periodic Law, and of Reynolds’ graphic representation of the results arrived at hy their successors on this re- markable subject. I reproduce, in Plate iy., with Dr. Reynolds’ permission, the most recent graphic representation of the Periodic Law. In this diagram the elements are plotted according to their atomic weights and valencies; the vertical co-ordinates being atomic weights, and the horizontal co-ordinates being valencies, counted (for conve- nience of plotting) positive or negative, according as the element belongs to an odd or even period of seven. First Period, or Carbon Period. ELEMENT. I ATOMIC WEIGHT. VALENCY. 1. Lithium. 7 Monad. 2. Beryllium. 9 Dyad. 3. Boron. 11 Triad. 4. Carbon. 12 Tetrad. 5. Nitrogen. 14 Triad. 6. Oxygen. 16 Dyad. 7. Fluorine. 19 Monad.
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