1. Mr. Skirbst Physical Science Topic 14
Periodic Table
Mr. Skirbst
Physical Science
Topic 14

2. Periodic Table
- An arrangement of elements based on a repeating pattern

3. Periodic Table
Dmitri Mendeleev (Russian Chemist)

4. Periodic Table
Dmitri Mendeleev (Russian Chemist) - In mid 1800’s, first to arrange elements into a periodic table

5. Periodic Table Dmitri Mendeleev’s Table
According to increasing atomic mass

6. Periodic Table Dmitri Mendeleev’s Table
According to increasing atomic mass
Predicted element #32 “ekasilicon”
(later discovered as Germanium)

7. Periodic Table
Henry Mosley (British Scientist)

8. Periodic Table
Henry Mosley (British Scientist) - In early 1900’s developed the Periodic Law (elements are arranged by atomic number = # of protons)

9. Periodic Table
Element Square:

10. Periodic Table Columns: Called “groups” or “families”
Elements have similar characteristics or properties

11. Periodic Table Rows: Called “periods”
Elements’ valence # increases from left to right
(valence = # “outer” electrons)

12. Periodic Table
groups

13. Periodic Table