Identifier: introductorycour00scho (find matches)
Title: An introductory course of lessons and exercises in chemistry (rewritten 1919)
Year: 1919 (1910s)
Authors: Schoch, Eugene Paul, 1871- (from old catalog)
Subjects: Chemistry
Publisher: (Austin) The Chemical laboratory of the University of Texas
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ation—2KC103=2KCl+302—gives more information than is needed in this calculation; theextra amount is naturally to be neglected. Problems: Calculate how much potassium chlorate will give 5grams of potassium chloride. How much potassium chloride will be obtained when 10 gramsof oxygen are obtained ? 13. Table of the Elements Arranged in Accordance •with TheirNatural Relations. If the names of the elements are arranged in the order of theiratomic numbers (such numbers being obtained by certain fre-quency measurements of the X-ray radiations of the elements, seefootnote I), which is generally also the order of their atomicweights, and if they are placed consecutively at equal intervalson a piece of tape and the tape wound on a suitable frame-work,as in the accompanying sketch, the vertical columns present thenames of similar elements or of elements which are closely re-lated in properties. 14 Schoch: Introductory Chemistry ^0 20 40 60 80 100 120 140 160 180 200 220 240 oh II <^R0U
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Harkins Model of the Periodic System. Chapter I 15 A simpler manner of printing the same arrangement is givenin the table below. The first complete table of this kind wasdrawn up by the Eussian chemist. Mendelejeff, and simultaneouslybut independently by the German chemist, Lothar Meyer, in 1869.It is known as the Periodic System of the Elements, because fromone element to the next similar element all the intervening ele-ments present a progression of properties which include all thedifferent types, and which progression ends on the element sim-ilar to the initial element. Each set of elements showing suchgraduation of properties is known as a period, and the aggregatearrangement of the entire series of periods is known as thePeriodic System. Stated briefly, the properties of the elementsas well as the properties (see footnote 2) of their compoundsform a periodic function or relation of the atomic numbers (orgenerally, atomic weights) of the elements. Exercise: Commit to memory the el

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