# The Periodic Table

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### The Periodic Table :

The Periodic Table

### Objectives :

Objectives Explain how periodic relates to the periodic table. Relate periodic lab to how the periodic table was made. Relate the electron configuration of an element to its position on the periodic table and its properties.

### Mendeleev: Father of the Table :

Mendeleev: Father of the Table HOW HIS WORKED… Put elements in rows by increasing atomic weight. Put elements in columns by the way they reacted. SOME PROBLEMS… He left blank spaces for what he said were undiscovered elements. (Turned out he was right!) He broke the pattern of increasing atomic weight to keep similar reacting elements together.

### Mendeleev: Father of Periodic Table. :

Mendeleev: Father of Periodic Table.

### Predicting Elements :

Predicting Elements Mendeleev put elements with the same properties in the same column. When organizing by increasing atomic mass, when a element didn’t fit he left blank spots.

### Predicting Elements :

Predicting Elements Mendeleev predicted that elements would one day be discovered to fill the blank spots. Mendeleev predicted they would have similar properties to elements in their column.

### Increasing Atomic Mass :

Increasing Atomic Mass Sometimes when Mendeleev ordered his table he found that some elements had to go out of order to fit in the “right” column. Ex. Ar and K, Co and Ni, Te and I He put them in the column that fit the property and thought that the mass would be discovered to be different one day.

### The Current Periodic Table :

The Current Periodic Table Mendeleev wasn’t too far off. Now the elements are put in rows by increasing ATOMIC NUMBER!!

### Rows and Columns :

Rows and Columns The horizontal rows are called periods and are labeled from 1 to 7. The vertical columns are called groups are labeled from 1 to 18. What group and period is Au (gold) in?

### Groups…Here’s Where the Periodic Table Gets Useful!! :

Groups…Here’s Where the Periodic Table Gets Useful!! Elements in the same group have similar chemical and physical properties!! (Mendeleev did that on purpose.) Elements in the same column have the same electron configuration.

### Groups…Here’s Where the Periodic Table Gets Useful!! :

Groups…Here’s Where the Periodic Table Gets Useful!! Electron configuration determines the properties of elements. Elements in the same column have similar electron configurations!