A treatise on chemistry / by Sir H.E. Roscoe, F.R.S., and C. Schorlemmer.

  • Henry Enfield Roscoe
Date:
1905-
Catalogue details

Licence: In copyright

Credit: A treatise on chemistry / by Sir H.E. Roscoe, F.R.S., and C. Schorlemmer. Source: Wellcome Collection.

    935/954 page 917
    metallic magnesium. No action is observed when argon is sparked with chlorine or with hydrogen. It is not absorbed or altered in volume when passed through a red-hot tube together with the vapours of' phosphorus, sulphur, tellurium or sodium. Fused alkalis and alkali peroxides do not act upon it, nor does nascent chlorine. Fluorine, the most active of the elements, does not enter into combination with argon, and this gas suffers no diminution in volume when sparked with the vapour of carbon tetrachloride nor when passed over heated titanium and uranium. Spectrum of Argon.—The spectrum of argon is extremely characteristic and has been carefully examined.1 Two different spectra are obtained according to the pressure of the gas and the intensity of the electric discharge; with a pressure of 3 mm. an orange glow is observed in the tube, and the spectrum shows a large number of lines in the red, two of which, having wave lengths of 6965'G and 7056’4, are especially prominent. Bright lines are also observed in all parts of the spectrum, the most noticeable being the line 60384 in the yellow, five lines in the green, the two brightest having wave lengths of 5610 and 4702 respectively, and five in the violet, the brightest of which has a wave length of 4200. With a lower pressure of gas and a more intense discharge the tube shows a bluish glow and the spectrum consists of 119 lines. KRYPTON, Kr = 8l 2 (H = i). = 8r8 (O = 16). 531 Krypton occurs in the air to the extent of about 1 part in 1,000,000 by volume and is found in the less volatile portions of liquid air, from which it is obtained pure by repeated fractional evaporation after the removal of oxygen and nitrogen (Ramsay and Travers). It may also be separated from air, along with xenon, by passing the air through a spiral tube packed with glass wool and cooled by liquid air.2 It boils at 1210-3 Absolute ( — 151 7 C.), at which temperature its density is 2155, and has the critical temperature 210 *5 1 Crookes, Phil., Trans. 1895, 243 ; Kayser, Chem. Xtws., 1895, 72, 99 ; Eder and Valenta, Monatsh., 1895, 16, 893; 1896, 17,50. Trowbridge and Richards, Phil. May., 1897, [5], 43, 77. - Dewar, Proc. Roy. Soc., 1901, 68, 360.
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