. Journal of roentgenology . THE RELATIVE SIZES OF ATOMS AND MOLECULES This diagram Is Intended to give an Idea of the relative magnitudesof atoms and molecules. However, the drawings are only symbolic, asthe dimensions have been calculated on the assumption that the mole-cules are spherical, which cannot be strictly true. It will be noticed thatthe smallest atom (that of hydrogen) differs only slightly In size fromthe largest atom (that of uranium). The starch molecule is probablyone of the largest which exists and It will be seen that, according to thediagram, it is very much larger than the
. Journal of roentgenology . THE RELATIVE SIZES OF ATOMS AND MOLECULES This diagram Is Intended to give an Idea of the relative magnitudesof atoms and molecules. However, the drawings are only symbolic, asthe dimensions have been calculated on the assumption that the mole-cules are spherical, which cannot be strictly true. It will be noticed thatthe smallest atom (that of hydrogen) differs only slightly In size fromthe largest atom (that of uranium). The starch molecule is probablyone of the largest which exists and It will be seen that, according to thediagram, it is very much larger than the largest atom or than the mole-cule of sugar. The relative weights of the particles represented are as fol-lows: Hydrogen, 1; Uranium, 239; Sugar, 366; and Starch, not accu-rately known but probably about 25,000. A molecule of ordinary alcoholweighing 46, would be slightly larger than the uranium atom. Illustration Copied from Comstock and TrolandFigure Two THE JOURNAL OF ROENTGENOLOGY. STRUCTURAL PLAN OF A SIMPLE CRYSTAL This drawing represents the structure of a crystal of potassium chloride,a substance similar to ordinary salt, as deduced from Its action upon X dark spheres represent chlorine atoms, the light ones atoms of po-tassium. It will be seen that the unit of structure of the crystal Is theIndividual atom, since all of the atoms are equidistant from their Imme-diate neighbors. For the sake of clearness, the spaces between the atomshave been exaggerated, as compared with their diameters. Illustration Copied from Comstock and TrolandFigure Three ORNDOFF —ROENTGEN TUBE
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