| Scientist | Contribution |
| $1$. Johann Dobereiner | Proposed the $Law \ of \ Triads$ $(1829)$,stating that the atomic weight of the middle element is approximately the average of the other two. |
| $2$. $A.E.B.$ de Chancourtois | Proposed the $Telluric \ Helix$ $(1862)$,a cylindrical arrangement of elements based on increasing atomic weights. |
| $3$. John Newlands | Proposed the $Law \ of \ Octaves$ $(1865)$,observing that every eighth element has properties similar to the first. |
| $4$. Dmitri Mendeleev | Formulated the $Periodic \ Law$ $(1869)$,stating that properties of elements are a periodic function of their atomic weights. |
| $5$. Lothar Meyer | Plotted physical properties like atomic volume against atomic weight,showing a periodic pattern $(1868)$. |
| $6$. Henry Moseley | Established the $Modern \ Periodic \ Law$ $(1913)$ by showing that properties are a periodic function of atomic number $(Z)$. |
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