1. 2.2.2 The Periodic Table Origin Of The Periodic Table
See page 104
Origin Of The Periodic Table
Chemists in the 19th century wished to organize elements
Attempts focused on grouping elements with similar properties
In 1867, Dimitri Mendeleev found patterns in the elements and organized them into a table
The resulting table had holes for elements not yet discovered

3. Some of Dalton's symbols for the elements with his estimates of molecular weight

4. Extended Dalton Table

5. Hinrichs’s Spiral Periodic System
G.D. Hinrichs’s spiral periodic system of 1867. Programm der Atomechanik oder die Chemie eine Mechanik de Pantome, Augustus Hageboek, Iowa City, IA, 1867.

6. Meyer's Spiral System of 1872 (from van Spronsen):

7. Meyer's "Lost" Table of 1868
In his book, The Periodic Table: A Very Short Introduction, Eric Scerri writes how Lothar Meyer produced an expanded periodic system for his1868 textbook which contained 53 elements. Unfortunately, the table was misplaced by the publisher and was not appear until after his death in 1895.

8. 1886
Crookes' Periodic Table

9. Periodic Table The Periodic Table provides information
See page 107
The Periodic Table provides information
on the physical and chemical properties of elements
Atomic Mass - mass of average atom
Atomic Number - number of protons
Ion Charge - electric charge that forms when an atom gains or loses electrons

10. Periodic Table
See page 106

12. Periods and Families
See pages 107
Each horizontal row in the periodic table is a period
Vertical columns form groups or chemical families
Alkali metals - highly reactive group 1
Alkaline earth metals - group 2, burn in air if heated
Halogens - group 17, highly reactive non-metals
Noble gases - group 18, stable and unreactive non-metals
Check out this table:

13. Metals, Non-metals, Metalloids
See page 110
Period table has patterns
Due to Mendeleev’s organization, patterns are created, such as the groups: metals, non-metals and metalloids.