-
Synthesised transuranic elements (the elements after uranium in the periodic table).
-
Determined the atomic number of each of the elements and modified the 'Periodic Law'.
-
Arranged the known elements in order of atomic weights & observed similarities between some elements
-
Produced a table based on atomic weights but arranged 'periodically' with elements with similar properties under each other. His Periodic Table included the 66 known elements organized by atomic weights.
-
Developed an early version of the periodic table, with 28 elements organized by valence.
-
Developed groups of 3 elements with similar properties.
-
Wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals.