Mendeleev - PowerPoint PPT Presentation

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Mendeleev

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Mendeleev & The Periodic Table Mendeleev for a Day Activity Mendeleev s Table Mendeleev s Prediction After Mendeleev placed all the known elements in his periodic ... – PowerPoint PPT presentation

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Title: Mendeleev


1
Mendeleev The Periodic Table
2
Mendeleev for a Day Activity



3
Mendeleevs Table
  • Organized elements by increasing atomic mass so
    that elements with similar properties were in the
    same column.

4
Mendeleevs Prediction
  • After Mendeleev placed all the known elements in
    his periodic table, several empty spaces were
    left.
  • In 1871 Mendeleev predicted the existence and
    properties of elements that would fill three of
    the spaces.
  • By 1886, all three of these elements had been
    discovered.

5
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6
Mendeleevs Prediction
  • Predicted Eka-aluminum in 1871
  • Soft metal
  • Low melting point
  • Density of 5.9 g/cm3
  • Found Gallium in 1875
  • Soft metal
  • Melting Point 29.7 C
  • Density of 5.91 g/cm3

7
Mendeleevs Predictions
8
Usefulness of His Table
  • The close match between Mendeleevs prediction
    and the actual properties of new elements showed
    how useful his periodic table could be.

9
Henry Moseley
  • (1913, British)
  • Organized elements by increasing atomic number.
  • Fixed problems in Mendeleevs arrangement.
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