The Cover Chronology of the Discovery of the Elements
This chart, showing the number of known elements as a. function of time, is self explanatory. Apart from such obvious pedagogic functions as providing 8. rapid answer to questions of when a particular element was first characterized, it also provides a graphic illustration of the impact of new eoncents and techniaues, . . such its the n o w t h of quantitative analytical methods in the early nineteenth'century, or the recognition of tL noble &es as a new fa& of elements in the early part of the twentieth century, on the rate of discovery of new elements. Data. were obtained from the "Handbook of Chemistry and Physics", (50th Ed.), The Chemical ltubher Co., Cleveland, Ohio, 1969. CALIFORNIA STATE COLLEGE LOSANGBLES. 90032
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Journal of Chemical Education
HAROLDGOLDW~ITE RICHARD C. ADAMS
