Students:
This VIDEO contains material from Section 5.1 of your text. In the 19th century, chemists compared the properties of known elements, in order to sort them into groups and (it was hoped) to find patterns: regularities, that might provide clues as to the internal organization of the elements.
In this 12-minute video, we will review some of the facts that prompted the development of the first periodic tables, and then discuss the basic features of the modern table: groups and periods, 'the stair step line', metals, non-metals and metalloids.
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