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JA

Jennifer Ames

Transcript

Mendeleev's Table

Moseley's Table

Arranged the elements by atomic mass.

Arranged the elements by atomic number.

Pros:

  • Lead to the reordering of several elements.
  • argon and potassium

  • Predicted the elements technetium and promethium (Numbers 43 and 61)
  • Allowed Mendeleev to predict the discovery of new elements
  • Allowed Mendeleev to point out inaccurate atomic weights being used at the time.

Cons:

  • Could not predict the existence of the noble gases.
  • A single position for hydrogen could not be assigned.

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