Mendeleev arranged the elements in order of increasing relative atomic mass, from the smallest to the ____ element. He spotted that there were patterns in how the elements reacted. He made sure that these elements went in the same ____. The amazing thing that Mendeleev did was to leave ____ for undiscovered elements. One example is an element he left a gap for is ____. Mendeleev also predicted what these elements were like based on the ____ of other elements in the same group.

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