Mendeleev’s Role Organization and discovery Organization and discovery.

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Presentation transcript:

Mendeleev’s Role Organization and discovery Organization and discovery

Periodic table history John Newland 1800’s Law of octaves. 63 elements Law of octaves – elements group in 8’s because they repeated the Same number of valence electrons

► Dmitri Mendeleev ► 2nd person to work on Periodic table ► Notice that elements didn’t Go together – some react violently ► Arranged by atomic Mass

► Henry Mosley ► group them by atomic number and they would have a better pattern/flow ► Physical and chemical properties are functions of the atomic #

► Periodic law- elements with similar properties occur in a regular pattern - Elements are arranged by increasing atomic number - Certain properties reoccur - Predictions can be made

Organization of the PT ► Rows go from left to right  They are called periods  Different properties  Valence electron increase.  Oxidation number changes

Organization of the PT ► Columns go up and down  They are called families or groups  There are 18 diff families