Periodic+Table+Notes

Periodic Table Notes 1. Elements were first arranged by their atomic mass. 2. Mendeleev (mend duh LAY ef) noticed that a pattern of properties appeared when he arranged the elements in order of increasing atomic mass. 3. A periodic table is an arrangement of elements showing their repeating pattern of properties. 4. The properties of an element can be predicted from its location on the periodic table. 5. Classes of elements have different properties: Metals, Semimetals, Nonmetals, and Inert Gases. 6. Horizontal rows of the periodic table are called periods. 7. From left to right the properties of the elements change from metals to semimetals to Nonmetals to Inert gases. 9. Vertical columns of the periodic table are called groups or families. 10. Groups consist of elements with similar characteristics.

https://blog.oup.com/2012/08/how-exactly-did-mendeleev-discover-his-periodic-table-of-1869/