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Organizing the Elements (The Periodic Table (Mendeleev liked to play…

- - - - he placed the cards for the elements into different groups and sorted the groups according to atomic mass
        
        discovered that arranging the know elements strictly by increasing atomic mass did not always produce similar groups
        
        moved his element cards into groups where they fit best
        
        this left three blank spaces
        
        confident enough of his discovery to predict that the blank spaces would be filled by elements that had not yet been discovered, he even predicted the properties of the new elements
- - - - similar characteristics
  - - - different types of elements from different families