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Pharmaceutical and chemical problems and exercises; with explanatory text; including pharmaceutical and chemical arithmetic, weights and measures, ... nomenclature, chemical equations, problems i - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ... But such a rule is furnished by the law of periodicity, as will now be shown. All metals are positive elements. All elements in immediate combination with metals are, then, negative elements. Hydrogen is a positive element. whenever combined with any other non-metallic element. 0xygen and fluorine are invariably negative elements in the compounds they form with any other elements, and any element when combined with oxygen or fluorine is then positive. The respective chemical polarities of the elements CI, Br, I, S, Se, Te, N, P, As, Sb, C and Si are determined by their connections, or, in other words, by the elements with which they are in immediate combination, and by their relative positions in the periodic system. The terms positive and negative as applied to the chemical elements are relative terms, for the same element may be positive in one compound and negative in another. Thus chlorine is a positive element when in combination with oxygen, but a negative element when in combination with any other element with which it is known to form any compound. (It is hypothetically positive toward fluorine.) As placed in a row in this paragraph any one of the twelve elements therein named by their symbols is a positive element when in combination with any element to its left but a negative element when in combination with any element to its right. It will be seen that the order in which these twelve nonmetallic elements are here placed is governed by their relative positions in the periodic system; in other words by their relative atomic weights. In the periodic table they are arranged as follows: They are positive or negative in their relations to each other according to this rule: 0f the non-metallic elements in the table arranged according to the law of per...
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