CH 101 Study Guide - Final Guide: Electron Configuration, Paramagnetism, Nonmetal

• School: University of Alabama
• Department: Chemistry
• Course: CH 101
• Professor: Jared M.Allred

Document Summary

In 1869, mendeleev noticed that certain groups of elements had similar properties: he found that when elements were listed in order of increasing mass, these similar properties recurred in a periodic pattern. To be periodic means to exhibit a repeating pattern: mendeleev summarized these observations in the periodic law: When the elements are arranged in order of increasing mass, certain sets of properties recur periodically. Mendeleev"s periodic table: organized known elements of the time in a table format. He arranged the rows so that elements with similar properties would fall in the same vertical columns: contained some gaps, which allowed him to predict the existence (and even the properties) of yet undiscovered elements. Mendeleev predicted the existence of an element he called eka-silicon. Elements in a group or family have similar properties. Note: mendeleev"s periodic law predicts pattern but does not explain why the patterns or similarity in properties occurs.