Chapter 5: The Periodic Table

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Chapter 5 The Periodic Table

• 5.1 Organizing the elements
• 5.2 The Modern Periodic Table
• 5.3 Representative groups

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Section 5.1

• Organization of the Elements

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Search for Order

• Brings order to seemingly unrelated facts
• Helped chemists predict the existence of elements
  that werent discovered yet
• Groups elements according to their chemical and
  physical properties

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Mendeleevs Periodic Table

• Strategy for organization What did he look at?
• chemical properties
• physical properties
• atomic mass
• density
• color
• melting point
• valence

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Mendeleevs Proposal

• Elements arranged in rows based on increasing
  mass.
• Elements with similar properties are in same
  column.
• Chart was a Periodic Table/ DEF. arrangement of
  elements in columns based on a set of properties
  that repeat.

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Mendeleevs Prediction

• Table incomplete elements not yet discovered
• Left spaces in table for undiscovered elements

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Evidence Supporting Mendeleevs Table

• Close match between Mendeleevs predictions and
  the actual properties of new elements showed how
  useful table was.
• Ex. Discovery of Aluminum, Gallium, Scandium,
  and Germanium