Compare Newland and Mendeleevs periodic table

• Newland

  Ordered the elements in increasing atomic weight

  Followed the law of octaves

  Didn't leave gaps

  Some elements in the same group didn't have the same properties.
• Mendeleev

  Ordered the elements by increasing atomic weight

  Grouped elements in similar properties

  Left gaps so undiscovered elements could be fitted in later on

  He swapped some elements so that they fitted in the right groups of similar properties