1. Periodic Table History Dmitri Mendeleev (1869) Creates periodic table with elements listed in increasing mass. Finds that properties repeat in the table. [http://www.stamprussia.com/463b.jpg]

2. [http://web.fccj.org/~ethall/2045/ch5/pt1871.gif]

3. [http://www.dlt.ncssm.edu/TIGER/diagrams/periodic/MendeleevPrediction.gif]

4. Periodic Table History Henry Moseley (1913) Current periodic table which lists in order of atomic number, from smallest to largest.

5. The Periodic Table [http://www.theschemata.com/gifconventional/17table.gif]

6. The Periodic Table

7. Periods – Each horizontal row of the periodic table. [http://www.chem4kids.com/files/art/elem_pertable3.gif]

8. The Periodic Table Groups – Each vertical column of the periodic table, also known as families. Elements in a group have similar properties. [http://www.chem4kids.com/files/art/elem_pertable3.gif]

9. The Periodic Table & Electrons The shape of the periodic table is due to where the electrons are located in an atom. [http://www.bpc.edu/mathscience/chemistry/images/periodic_table_of_elements.jpg] Nothing here???

10. The Periodic Table & Electrons “Blocks” of the periodic table represent the last type of cloud that electrons occupy. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_09/FG09_17.JPG] “S” Cloud

11. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_09/FG09_29.JPG] “S” Cloud

12. “P” Clouds

13. The Periodic Table & Electrons Electron Configurations show where electrons are located in an atom. Example: H is 1s 1 Period # Cloud Type # of Electrons

14. The Periodic Table & Electrons [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_09/FG09_28.JPG] Example: Oxygen1s 2 2s 2 2p 4 (e - = 8)

15. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_09/FG09_28.JPG] Example: Magnesium 1s 2 2s 2 2p 6 3s 2 (e - = 12) The Periodic Table & Electrons

16. Valence Electrons are the “outside” electrons in an atom Highest period number = Highest energy level The Periodic Table & Electrons

17. Or you could look at the group number… Silicon has 4 valence electrons The Periodic Table & Electrons