The Periodic Table

1
I. History

• The Periodic Table

2
A. Mendeleev

• Dmitri Mendeleev (1869, Russian)
• Organized elements by increasing atomic mass.
• Elements with similar properties were grouped
  together.
• There were some discrepancies.

3
A. Mendeleev

• Dmitri Mendeleev (1869, Russian)
• Predicted properties of undiscovered elements.

4
B. Moseley

• Henry Mosely (1913, British)
• Organized elements by increasing atomic number.
• Resolved discrepancies in Mendeleevs arrangement.

5
II. Organization of theElements

• Ch. 5 - The Periodic Table

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A. Metallic Character

• Metals
• Nonmetals
• Metalloids

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B. Blocks

• Main Group Elements
• Transition Metals
• Inner Transition Metals