Periodic Table History

1
Periodic Table History

• Ch.5 Sec. 1

2
Organizing the Table

• 1750 17 known elements
• Microscopes more found
• 1789 - Antoine Lavoisier grouped the known
  elements into 4 categories
• Metals
• Nonmetals
• Gases
• Earths

3
Mendeleev

• 1860s - Russian chemist Dmitri Mendeleev
• Wanted to organize 63 elements for chemistry
  students
• Figured out organization while playing cards
  (solitaire)

4
Mendeleevs Arrangement

• Rows of increasing mass
• Elements in same columns had same properties
• Called periodic table

5
Mendeleevs Periodic Table
6
Mendeleevs Table

• Could not make complete table b/c some elements
  not discovered yet
• Later discoveries only supported his arrangement

7
Modern Periodic Table