By Henry E Roscoe; Carl Schorlemmer; John Cannell Cain; Charles Henry Jeens; Bernard Mouat Jones
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The molecular constitution hypothesis--that a molecule is a suite of atoms associated through a community of bonds-- offers the relevant technique of ordering and classifying observations in chemistry. notwithstanding this speculation isn't comparable on to the physics which governs the motions of atomic nuclei and electrons.
Prof. Dr. -Ing. Reinhard Seeling - Rheinisch-Westfälische Technische Hochschule Aachen
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It is as yet imperfect, and its value can only be properly appreciated when a fuller knowledge of the properties of the elements has been gained. QBNESftAt PRINCIPLES OP THE SOlBNClJ. ABRAKGEMENT OF THE ELEMENTS. Symbol Hydrogen . H = Chlorine . Cl Broimne . Br * Iodine . I fluorine . F Oxygen, Sulphur Selenium Tellurium . . 0 S Se Te ^|£ 1 35*37 79*75 a™,i,«i Symbol. Nitrogen . N =» Phoaphorua . P = Arsenic . As » = 126*53 •= 19*1 = a « m 16*96 31*98 79*0 128*0 Boron. . B - 11-0 Carbon .
182-0 . 128-0 . 148-5 . 203-6 . 231-5 117-8 . 480 . 183-5 . 240-0 . 512 . 92-5 64-9 . 90-0 NAMES OF THE KLEMENTS. £3 In addition to the above the existence of several other elements, discovered in certain rate Norwegian and American minerals, has been announced. These, however, have not as yet been very perfectly investigated, and their atomic weights and chemical, relationships remain undetermined. For the sake of convenience it is customary to divide the elements into two classes—the Metals and the Non-Motak, or Metalloids, a distinction which was first made about the time of Lavoisier, when only a few elements were known.
6a «• 69-8 Gold . . Au = 19(5-2 Platinum. Pfc - 196-7 Palladium , Pd « 106'2 Bhodiuni. Kh. = 104-1 Indium . Ir » 192-7 Euthenium Omnium . " 103-5 « 198*6 AKBANGBMBNT OF TJBB ELEMENTS. 65 Of these elements only four occur in the air, about thirty have been detected in the sea, whilst all the sixty-five are found Irregularly distributed throughout the solid mass of our planet. In order to obtain an idea as to which elements form the main portion of the solid crust of the earth, we may examine the composition of all the different kinds of granitic or eruptive rocks which constitute by far the greater part of the earth's erost.
A treatise on chemistry by Henry E Roscoe; Carl Schorlemmer; John Cannell Cain; Charles Henry Jeens; Bernard Mouat Jones