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Willard, H. H. and Diehl, H., "Advanced Quantitative Analysis," pp. 339-345, D. Van Nostrand Co., New York, 1943. Walton, H. F., "Principles and Methods of Chemical Analysis," pp. 161-163 and pp. 411-412, Prentice^iall, Inc., New York, 1952. Hillebrand, W. F., Lundell, G. E. F., Bright, H. A. and Hoffman, J. I., "Applied Inorganic Analysis," Chapter 13, pp. 256-272, 2nd Edition, John Wiley and Sons, New York, 1953. Chariot, G. and Bejier, D. translated by Murray, R. C., "Quantitative Inorganic Analysis," pp. 335-342, Methuen and Co., London; John Wiley and Sons, Inc., New York, 1957. Furman, N. H., "Standard Methods of Chemical Analysis" 6th Edition. Vol. 1 pp. 106-107. Van Nostrand, New York, 1962. II. GENERAL REVIEWS OF THE RADIOCHEMISTRY OF ARSENIC Smales, A. A., "Neutron Activation Analysis," Chapter 19, pp. 518-545 in Yoe, J. H. and Koch, J. J., Jr., "Trace Analysis," John Wiley and Sons, New York, 1957. HI. SUMMARY OF STATISTICAL PHYSICAL PROPERTIES OF ARSENIC(1) Outer electronic configuration 4s 4p Molecular state of gas As^^ As2 Atomic volume, 13.13 ml. (metal) Melting point, 814.5°C. (36 atm). Boiling point, sublimes at 610°C. Density, 5.7 g/cc (metal); 3.9 g/cc (yellow) Radius, covalent, 1.21 A Radius, crystal, As~3 2.22 A ; As+3 0.69A ; As+5 (As03~) 0.47 A lonization potential,~ 10 e.v. Electronegativity, 2.0 on the Pauling scale. Principal oxidation states, -3, +3, +5 E°, As + 3 H20 ^ H3As03 + 3 H+ + 3 e~, -0.25 v. (HAs02); As02 + 2 H20 ^ H3As04 + 2 H+ + 2 e~, -0.559 v. Heat capacity, 0.082 cal/gram.