142
JOURNAL OF CHEMICAL EDUCATION
.
J a w n n ~ ,1931
cal and chemical properties of the element which it represented. Various references were used in the preparation of these talks. As an introduction a student gave a brief history of the periodic classification pointing out the periodic changes of the properties of the elements by means of a chart An outline for a talk on the chlorine atom is given below: Name--Chlorine Symhol-C1 Melting point- -101.6°C. Boiling point- -34.6-C. Color of gas-greenish yellow Atomic volume of solid cc.-23.52 Atomic weight-35.46 Isotopep35.37 Atomic numher-17 Electrons in various quantum levels: lst-2 2nd4 3rd-7
Heat of vaporization cal. per mole5000 Heat of fusion cal. per mole--1634 Solubility in water moles CI. per liter0.090 (1atm.) Analytical Detection Estimation Gravimetrically Volumetrically Interesting Reactions
Conclusion In the judging of the contest two points were taken into consideration: first, the technic used in constructing the model; second, the knowledge of the subject matter shown by the student in his talk. References 1.
GORDON, "Introductory Chemistry." New World Book Co., New York, 1927,
*
p p 3636. 2. HILUBERAND, "Principles of Chemistry," Revised edition, The Macmillan Company, New York City, 1926, pp. 25F72. 3. LATIMERand HnDEBRAND, "A Reference Book of Inorganic Chemistry." The Macmillan Company, New York City. 1929, p. 122. 4. LINCOLN, "Physical Chemistry," D. C. Heath & Co., Boston, Mass., 1918, pp. 64-81.
Garlic Smelling Metal, Tellurium, Useful in Disease Treatment. If the patient can stand the smell of tellurium, which has an intense garlic odor, it may prove aseful in the treatment of syphilis in cases that do not respond to more usual medication. Dr. A. D. Frazer, a health officer of the County Borough of Dudley, treated with tellurium or its salts, seven individuals who contracted the disease, most of them more than twenty years ago. Four cases out of the seven were favorably influenced by this new drug, though the standard cures were ineffective. Tellurium has the advantareover many other drugs in that it produces improvement when the disease is of long duration and firmly entrenched and the patient becomes resistant to treatment. Since tellurium in the amounts given to patients is not poisonous, its only disadvantage seems to he the offensive smell. In countries where the aroma of garlic is tolerated or even liked, tellurium will, a m d i n g to Dr. Frazer, prove of great value Science Setvice ~
~~~
-
