A treatise on chemistry by Henry E Roscoe; Carl Schorlemmer; John Cannell Cain; Charles

By Henry E Roscoe; Carl Schorlemmer; John Cannell Cain; Charles Henry Jeens; Bernard Mouat Jones

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Soap-bubbles blown with hydrogen ascend in the air, 42 GENERAL PMNCIPLE8 OP THE SCIENCE. and if hydrogen be poured upwards into the equipoised bell-jar hung mouth downwards on the arm of the balance (Kg. 8), the equilibrium will be disturbed, and the arm with the bell-jar will rise. a On August 1st, 1774, Priestley heated some red precipitate (oxide of mercury) and obtained from it a new colourless gas called oxygen, and this, although invisible, possesses Fro. 2. properties quite different from those of air, carbonic acid gas, or hydrogen gas.

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.

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 . C » 11*97 Silicon . Mi = 28*0 I I . - -METALS. Manganese. Mn « « 39*04 Iron . . Fe - 22*99 7-01 (Jobalt . Co *= Nickel . Ni = 85*2 - 132f» Chromium . Cr » Molybdenum. Mo = Calcium . Ca « 39-9 Tungsten. W = Strontium. Sr = 87-2 Uranium . TJ « Barium. Ba =• 136-8 Potassium. Sodium. Lithium . KubidiuBi. Caesium . Atomic mi^u 14-01 3tt*96 74*9 K Na Li Eb Cu 54*8 55*9 58-6 58-6 52-4 95-8 183-5 240-0 Berylliuin , Be Magnesium Mg Zinc.

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