CHEM 1210 Chapter Notes - Chapter 9: Atomic Number, Iodine, Metal

• School: Ohio State University
• Department: Chemistry
• Course: CHEM 1210
• Professor: A L L

Document Summary

Chapter 9- the periodic table and some atomic properties. In 1869, dmitri mendeleev and lothar meyer independently proposed the periodic law: When the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically . Meyer presented his results as a graph of atomic volume against atomic mass. High atomic volumes recur periodically for the alkali metals li, na, k, rb, and cs. Mendeleev s periodic table consisted of 8 groups, One group of elements that mendeleev did not anticipate was the noble gases. William ramsay, their discoverer, proposed placing them in a separate group of the table. Because argon, the first noble gas discovered (1894), had an atomic mass greater than that of chlorine and comparable to that of potassium, Ramsay placed the new group, which he called group 0, between the halogen elements (group vii) and the alkali metals (group i). Description of a modern periodic table: the long form.